{"id":21720,"date":"2026-01-08T16:00:54","date_gmt":"2026-01-08T16:00:54","guid":{"rendered":"https:\/\/futurismo.pt\/blog\/do-whales-and-dolphins-lay-eggs-scientific-approach\/"},"modified":"2026-01-08T16:03:56","modified_gmt":"2026-01-08T16:03:56","slug":"do-whales-and-dolphins-lay-eggs-scientific-approach","status":"publish","type":"post","link":"https:\/\/staging.futurismo.pt\/pt\/blog\/as-baleias-e-os-golfinhos-poem-ovos-abordagem-cientifica\/","title":{"rendered":"As baleias e os golfinhos p\u00f5em ovos? | Abordagem cient\u00edfica"},"content":{"rendered":"<p>Quando se trata de baleias e golfinhos, h\u00e1 normalmente alguma confus\u00e3o. S\u00e3o peixes? S\u00e3o mam\u00edferos? Mas ser\u00e1 que importa o grupo em que estes animais se encontram? Bem, uma coisa \u00e9 certa... importa sim! Por muito que pare\u00e7am semelhantes, os peixes e os mam\u00edferos marinhos t\u00eam muitas carater\u00edsticas diferentes.<\/p>\n\n\n\n<p>Entre outras diferen\u00e7as, a forma como carregam os seus beb\u00e9s e os amamentam \u00e9 uma das principais diferen\u00e7as entre estes dois grandes grupos de animais marinhos.<\/p>\n\n\n\n<p>As baleias e os golfinhos p\u00f5em ovos como os peixes? Continue a ler para descobrir!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-do-whales-amp-dolphins-actually-lay-eggs\">As baleias e os golfinhos p\u00f5em mesmo ovos?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-they-are-marine-mammals\">S\u00e3o mam\u00edferos marinhos<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/David_Sao-Miguel_Species_bottlenose-dolphin_Roaz_Roazes-Corvineiros-3-scaled.jpg\" alt=\"David Rodrigues | Golfinhos roazes, supostamente uma m\u00e3e e o seu filho. as baleias e os golfinhos p\u00f5em ovos\" class=\"wp-image-7727\"\/><figcaption class=\"wp-element-caption\">David Rodrigues | Golfinhos roazes, supostamente uma m\u00e3e e o seu filho.<\/figcaption><\/figure>\n<\/div>\n\n\n<p>As baleias, os golfinhos e os botos s\u00e3o aquilo a que n\u00f3s, cientistas marinhos, chamamos cet\u00e1ceos. Basicamente, os cet\u00e1ceos s\u00e3o mam\u00edferos marinhos que est\u00e3o totalmente adaptados \u00e0 vida no oceano. Assim, enquanto mam\u00edferos, os cet\u00e1ceos est\u00e3o mais pr\u00f3ximos de n\u00f3s do que os peixes. Porqu\u00ea? J\u00e1 vais perceber isto.\u00a0<\/p>\n\n\n\n<p>Como j\u00e1 foi dito, os peixes e os mam\u00edferos marinhos n\u00e3o partilham a forma como carregam os seus beb\u00e9s ou o seu comportamento de amamenta\u00e7\u00e3o. Mas, mesmo assim, as baleias e os golfinhos podem p\u00f4r ovos? Na verdade, os mam\u00edferos marinhos carregam os seus beb\u00e9s da mesma forma que n\u00f3s, num saco amni\u00f3tico dentro do \u00fatero da m\u00e3e.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.futurismo.pt\/tours\/whale-watching-in-ponta-delgada-sao-miguel-azores\/\" target=\"_blank\" rel=\"noreferrer noopener\"><img fetchpriority=\"high\" decoding=\"async\" width=\"815\" height=\"250\" src=\"https:\/\/www.futurismo.pt\/wp-content\/uploads\/2024\/12\/12.jpg\" alt=\"\" class=\"wp-image-35102\" srcset=\"https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2024\/12\/12.jpg 815w, https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2024\/12\/12-300x92.jpg 300w, https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2024\/12\/12-768x236.jpg 768w, https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2024\/12\/12-18x6.jpg 18w\" sizes=\"(max-width: 815px) 100vw, 815px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>De facto, as baleias e os golfinhos t\u00eam fecunda\u00e7\u00e3o interna, carregam os seus beb\u00e9s e d\u00e3o \u00e0 luz crias vivas. Al\u00e9m disso, os mam\u00edferos marinhos cuidam dos seus beb\u00e9s depois de estes nascerem e amamentam com o leite materno, cujos compostos s\u00e3o um pouco diferentes dos dos humanos.\u00a0<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Sabia que?<\/strong><br><br>Os cet\u00e1ceos s\u00e3o un\u00edparos, o que significa que d\u00e3o \u00e0 luz um \u00fanico rec\u00e9m-nascido, embora possam ocorrer g\u00e9meos e at\u00e9 trig\u00e9meos.<\/summary>\n<p><\/p>\n<\/details>\n\n\n\n<p>Por outro lado, a maior parte das esp\u00e9cies de peixes transportam os seus beb\u00e9s em ovos que depositam em locais espec\u00edficos. Quando os ovos eclodem, as larvas emergem e vivem por si pr\u00f3prias.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/Alvaro_Sao-Miguel_Species_False-killer-whale_Orca-cria-scaled.jpg\" alt=\"\u00c1lvaro Pal\u00e1cios | Uma orca adulta e uma juvenil. as baleias e os golfinhos p\u00f5em ovos\" class=\"wp-image-7733\"\/><figcaption class=\"wp-element-caption\">\u00c1lvaro Pal\u00e1cios | Uma orca adulta e uma orca juvenil<\/figcaption><\/figure>\n<\/div>\n\n\n<p>\u2728 <strong>Artigos relacionados<\/strong>: <a href=\"https:\/\/www.futurismo.pt\/blog\/are-dolphins-endangered\/\">Os golfinhos est\u00e3o em perigo de extin\u00e7\u00e3o?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/are-pink-dolphins-real\/\">Os golfinhos cor-de-rosa s\u00e3o reais?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/dolphins-eat-tuna\/\">Os golfinhos comem atum?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/do-dolphins-smell-scientific-fact-check\/\">Os golfinhos cheiram mal?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/do-whales-and-dolphins-lay-eggs-scientific-approach\/\">As baleias e os golfinhos p\u00f5em ovos?<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-differences-between-fish-amp-marine-mammals\">Diferen\u00e7as entre peixes e mam\u00edferos marinhos<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/cachalotebebe-scaled.jpg\" alt=\"\" class=\"wp-image-8107\"\/><figcaption class=\"wp-element-caption\">Laura Forte | Uma m\u00e3e <a class=\"wpil_keyword_link\" title=\"Cachalote\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"347\" href=\"https:\/\/futurismo.pt\/species\/sperm-whale\/\" target=\"_blank\" rel=\"noopener\">Cachalote<\/a> e a sua cria em <a class=\"wpil_keyword_link\" title=\"S\u00e3o Miguel\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"336\" href=\"https:\/\/futurismo.pt\/islands\/sao-miguel-island-azores\/\" target=\"_blank\" rel=\"noopener\">S\u00e3o Miguel<\/a> Ilha<\/figcaption><\/figure>\n<\/div>\n\n\n<p>No entanto, n\u00e3o s\u00f3 existem diferen\u00e7as entre os peixes e os mam\u00edferos marinhos no que respeita \u00e0s suas caracter\u00edsticas de reprodu\u00e7\u00e3o, como tamb\u00e9m na sua respira\u00e7\u00e3o e fisiologia do mergulho.<\/p>\n\n\n\n<p>Os cet\u00e1ceos t\u00eam pulm\u00f5es, o que significa que n\u00e3o podem respirar debaixo de \u00e1gua e t\u00eam de subir \u00e0 superf\u00edcie para absorver o oxig\u00e9nio do ar. Por isso, sim, s\u00e3o \u00f3ptimos mergulhadores livres! Agora, o tempo que conseguem aguentar debaixo de \u00e1gua depende da esp\u00e9cie e do tamanho dos indiv\u00edduos, variando entre 5 e 60 minutos. Ao contr\u00e1rio dos cet\u00e1ceos, os peixes t\u00eam pregas cut\u00e2neas chamadas guelras que utilizam para captar o oxig\u00e9nio da \u00e1gua, raz\u00e3o pela qual n\u00e3o t\u00eam de subir \u00e0 superf\u00edcie para respirar.<\/p>\n\n\n\n<p>\u2728 <strong>Artigos relacionados<\/strong>: <a href=\"https:\/\/www.futurismo.pt\/blog\/how-do-dolphins-mate-scientific-approach\/\">Como \u00e9 que os golfinhos acasalam?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/how-do-dolphins-sleep-scientific-approach\/\">Como \u00e9 que os golfinhos dormem?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/how-do-whales-and-dolphins-communicate-scientific-approach\/\">Como \u00e9 que as baleias e os golfinhos comunicam?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/what-is-a-group-of-dolphins-called-scientific-approach\/\">Como se chama um grupo de golfinhos?<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/how-long-do-dolphins-live\/\">Top-3 factos e curiosidades sobre os golfinhos<\/a> | <a href=\"https:\/\/www.futurismo.pt\/blog\/what-do-dolphins-eat-scientific-approach\/\">O que \u00e9 que os golfinhos comem?<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-gestation-process\">Processo de gesta\u00e7\u00e3o<\/h2>\n\n\n<div class=\"wp-block-image is-style-default\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/2_Moment-1024x576.jpg\" alt=\"\" class=\"wp-image-8621\"\/><figcaption class=\"wp-element-caption\">Anxo Cao | Cachalote beb\u00e9 com marcas de nascimento e cord\u00e3o umbilical na Ilha de S\u00e3o Miguel<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Como j\u00e1 foi dito, os cet\u00e1ceos engravidam de um beb\u00e9 e, depois de este nascer, amamentam-no com o leite da m\u00e3e. A dura\u00e7\u00e3o da gravidez, bem como as vezes que engravidam ao longo da vida, variam consoante a esp\u00e9cie. Na tabela seguinte, s\u00e3o apresentadas v\u00e1rias esp\u00e9cies de baleias e golfinhos, ordenadas da maior para a mais pequena, com os respectivos tempos de parto, gesta\u00e7\u00e3o e desmame.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Esp\u00e9cies<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Comum <\/strong><br><strong>nome<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Gesta\u00e7\u00e3o<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Parto<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Desmame<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Balaenoptera <\/em><br><em>musculus<\/em><\/td><td class=\"has-text-align-center\" data-align=\"center\">Baleia azul&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">10 - 12 meses<\/td><td class=\"has-text-align-center\" data-align=\"center\">2 anos&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">6 - 8 meses<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Megaptera <\/em><br><em>novaenglidae<\/em><\/td><td class=\"has-text-align-center\" data-align=\"center\">Jubarte <br>baleia<\/td><td class=\"has-text-align-center\" data-align=\"center\">11 - 11.5 <br>meses<\/td><td class=\"has-text-align-center\" data-align=\"center\">2 anos&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">10 - 12 meses<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Fisiculturista <\/em><br><em>macrocefalia<\/em><\/td><td class=\"has-text-align-center\" data-align=\"center\">Cachalote&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">14 - 16 meses&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">5 - 6 anos&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">2 anos&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Balaenoptera <\/em><br><em>acutorostrata<\/em><\/td><td class=\"has-text-align-center\" data-align=\"center\">Baleia an\u00e3&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">10 - 12 meses<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 ano&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">4 - 6 meses&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Orcino <a class=\"wpil_keyword_link\" href=\"https:\/\/futurismo.pt\/species\/orca-killer-whale\/\" target=\"_blank\" rel=\"noopener\" title=\"orca\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"373\">orca<\/a><\/em><\/td><td class=\"has-text-align-center\" data-align=\"center\">Orca&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">15 - 18 meses<\/td><td class=\"has-text-align-center\" data-align=\"center\">3 - 8 anos<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 - 2 anos&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Globicephala macrorhynchus<\/em><\/td><td class=\"has-text-align-center\" data-align=\"center\">De barbatana curta <br>baleia-piloto&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">14 - 15 meses&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">3 - 5 anos<\/td><td class=\"has-text-align-center\" data-align=\"center\">2 - 3 anos&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Tursiops truncatus&nbsp;<\/em>&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">Roaz <br>golfinho<\/td><td class=\"has-text-align-center\" data-align=\"center\">12 - 12.5 <br>meses<\/td><td class=\"has-text-align-center\" data-align=\"center\">3 - 6 anos<\/td><td class=\"has-text-align-center\" data-align=\"center\">1,5 - 2 anos&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><em>Delphinus dolphis<\/em>&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">Comum <br>golfinho<\/td><td class=\"has-text-align-center\" data-align=\"center\">10 - 11.5 <br>meses<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 - 4 anos&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">10 - 19 meses<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Tabela 1.  Tempo em que as baleias e os golfinhos est\u00e3o gr\u00e1vidos, a cuidar das crias e a amamentar.<\/figcaption><\/figure>\n\n\n\n<p>Em m\u00e9dia, as gravidezes dos cet\u00e1ceos duram cerca de um ano e, uma vez nascidas, as crias ficam com as m\u00e3es entre um e oito anos, como \u00e9 o caso dos golfinhos comuns, sendo 8 anos o tempo m\u00e1ximo que as crias de orca podem ficar com os pais.  Como mam\u00edferos marinhos, as crias alimentam-se do leite materno durante um per\u00edodo que, mais uma vez, depende da esp\u00e9cie.\u00a0<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/David_Sao-Miguel_whalewatching_Commondolphin_juvenile-scaled.jpg\" alt=\"David Rodrigues | Um golfinho comum beb\u00e9 a saltar ao lado da m\u00e3e As baleias e os golfinhos p\u00f5em ovos\" class=\"wp-image-7739\"\/><figcaption class=\"wp-element-caption\">David Rodrigues | Um golfinho comum beb\u00e9 a saltar ao lado da sua m\u00e3e<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-birth-amp-first-few-hours-of-the-newborn\">Nascimento e primeiras horas do rec\u00e9m-nascido<\/h2>\n\n\n\n<p>O feto desenvolve-se no interior do \u00fatero materno durante cerca de um ano, dobrado para o lado direito ou para o lado esquerdo, com a cauda colocada perto do cr\u00e2nio. De facto, depois de nascerem, ficam com as chamadas pregas fetais; algumas marcas da posi\u00e7\u00e3o de dobragem que s\u00e3o vis\u00edveis nos rec\u00e9m-nascidos de semanas a meses ap\u00f3s o nascimento. Podemos ver isto com bastante frequ\u00eancia nos nossos <a href=\"https:\/\/futurismo.pt\/blog\/whale-watching-in-azores-when-is-the-best-time\/\" target=\"_blank\" rel=\"noreferrer noopener\">viagens de observa\u00e7\u00e3o de baleias e golfinhos<\/a>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/risso-baby@Anxo-1024x681.jpg\" alt=\"Anxo Cao | Um golfinho de Risso beb\u00e9 \" class=\"wp-image-7745\"\/><figcaption class=\"wp-element-caption\">Anxo Cao | Um golfinho de Risso beb\u00e9 <\/figcaption><\/figure>\n<\/div>\n\n\n<p>Durante o trabalho de parto, verifica-se que, por vezes, a m\u00e3e pode sofrer dores fortes e o parto pode durar algumas horas. A primeira proje\u00e7\u00e3o do rec\u00e9m-nascido atrav\u00e9s da vulva da m\u00e3e \u00e9 a barbatana caudal. Como mam\u00edferos, os cet\u00e1ceos t\u00eam uma gravidez semelhante \u00e0 dos humanos.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>O feto ser\u00e1 alimentado com os nutrientes provenientes da m\u00e3e atrav\u00e9s do cord\u00e3o umbilical.&nbsp;<\/p>\n<\/blockquote>\n\n\n\n<p>As m\u00e3es das baleias de bico, como as baleias azuis, n\u00e3o comem a placenta nem mordem o cord\u00e3o umbilical quando a cria nasce, ao contr\u00e1rio do que acontece noutras esp\u00e9cies de mam\u00edferos. Em vez disso, a cria pode ficar ligada \u00e0 m\u00e3e durante alguns dias ap\u00f3s o nascimento, como pode acontecer tamb\u00e9m com alguns golfinhos. No entanto, em alguns golfinhos, a separa\u00e7\u00e3o ocorre logo ap\u00f3s o nascimento, quando a m\u00e3e continua a nadar durante alguns metros. E sim, quando o cord\u00e3o umbilical cai, eles tamb\u00e9m ficam com o umbigo.<\/p>\n\n\n\n<p>Quando os beb\u00e9s est\u00e3o no gigante azul, t\u00eam de aprender a respirar. E pelo menos a primeira respira\u00e7\u00e3o do rec\u00e9m-nascido \u00e9 induzida pela m\u00e3e e por outros membros do grupo, que o empurram para a superf\u00edcie.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/@David-Rodrigues_WW_SaoMiguel_OCT2021-11-scaled.jpg\" alt=\"David Rodrigues | \u00c9 poss\u00edvel distinguir um golfinho-pintado juvenil de um adulto gra\u00e7as \u00e0s manchas inexistentes nos juvenis\" class=\"wp-image-7757\"\/><figcaption class=\"wp-element-caption\">David Rodrigues | \u00c9 poss\u00edvel distinguir um golfinho-pintado juvenil de um adulto gra\u00e7as \u00e0s manchas inexistentes nos juvenis<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-do-calves-feed-on-amp-how\">De que se alimentam os vitelos e como<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/futurismo.pt\/wp-content\/uploads\/2023\/12\/Anxo-Cao-Roazes-12312-scaled.jpg\" alt=\"Axo Cao | Golfinhos roazes nos A\u00e7ores\" class=\"wp-image-7751\"\/><figcaption class=\"wp-element-caption\">Anxo Cao | Golfinhos roazes nos A\u00e7ores<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Como mam\u00edferos, as crias dos cet\u00e1ceos alimentam-se de leite materno durante um per\u00edodo que, como j\u00e1 foi dito, depende da esp\u00e9cie - ver quadro 1, coluna do desmame para informa\u00e7\u00f5es espec\u00edficas sobre a esp\u00e9cie. Ora, o leite dos cet\u00e1ceos \u00e9 muito diferente do leite de vaca ou do leite humano. Pensemos nisto: se fosse t\u00e3o l\u00edquido como o leite humano, dispersar-se-ia facilmente na \u00e1gua; por isso, o leite de cet\u00e1ceo tem uma maior quantidade de gorduras do que o leite humano. Por isso, o leite dos cet\u00e1ceos tem uma maior quantidade de gorduras do que o leite humano.\u00a0<\/p>\n\n\n\n<p>Al\u00e9m disso, os cet\u00e1ceos t\u00eam os seus pr\u00f3prios mecanismos para evitar a dispers\u00e3o do leite. Por exemplo, as gl\u00e2ndulas mam\u00e1rias est\u00e3o \"escondidas\" em pregas na parte ventral do animal, pelo que, na maioria das esp\u00e9cies - com exce\u00e7\u00e3o das esp\u00e9cies de baleias de barbas -, os vitelos t\u00eam de inserir a mand\u00edbula inferior nessas pregas para beber o leite.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Sabia que?<\/strong><br><br>Os cet\u00e1ceos nascem na dire\u00e7\u00e3o oposta \u00e0 dos seres humanos: primeiro emerge a cauda e, por \u00faltimo, a cabe\u00e7a.<\/summary><\/details>\n\n\n\n<p>Ao contr\u00e1rio dos beb\u00e9s humanos, que crescem lentamente durante o per\u00edodo de lacta\u00e7\u00e3o, as crias de cet\u00e1ceos aumentam rapidamente de tamanho desde o nascimento at\u00e9 ao desmame, pois t\u00eam de ser suficientemente fortes para enfrentar os muitos perigos da vida selvagem. \u00c9 por isso que a quantidade de leite produzido pela m\u00e3e deve ser extraordin\u00e1ria, para al\u00e9m de altamente rica em nutrientes.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.futurismo.pt\/tours\/whale-watching-in-lajes-do-pico-azores\/\" target=\"_blank\" rel=\" noreferrer noopener\"><img decoding=\"async\" width=\"815\" height=\"250\" src=\"https:\/\/www.futurismo.pt\/wp-content\/uploads\/2025\/03\/Banner-Comercial_-Whale-Watching-Lajes-do-Pico-1.jpg\" alt=\"\" class=\"wp-image-37581\" srcset=\"https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2025\/03\/Banner-Comercial_-Whale-Watching-Lajes-do-Pico-1.jpg 815w, https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2025\/03\/Banner-Comercial_-Whale-Watching-Lajes-do-Pico-1-300x92.jpg 300w, https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2025\/03\/Banner-Comercial_-Whale-Watching-Lajes-do-Pico-1-768x236.jpg 768w, https:\/\/staging.futurismo.pt\/wp-content\/uploads\/2025\/03\/Banner-Comercial_-Whale-Watching-Lajes-do-Pico-1-18x6.png 18w\" sizes=\"(max-width: 815px) 100vw, 815px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p>Em conclus\u00e3o, as baleias e os golfinhos n\u00e3o p\u00f5em ovos porque s\u00e3o mam\u00edferos marinhos. Por conseguinte, d\u00e3o \u00e0 luz tal como n\u00f3s, humanos. No entanto, a gesta\u00e7\u00e3o varia consoante a esp\u00e9cie. Mas o conceito \u00e9 o mesmo. Por outras palavras, os seres humanos e os cet\u00e1ceos t\u00eam mais coisas em comum do que se possa imaginar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-references\">Refer\u00eancias<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Berta, A., Sumich, J. L., &amp; Kovacs, K. M. (2006). <em>Mam\u00edferos marinhos: biologia evolutiva<\/em> (Elsevier (ed.); 2\u00aa ed.).<\/li>\n\n\n\n<li>Oftedal, O. T. (1997). Lacta\u00e7\u00e3o em baleias e golfinhos: Evidence of divergence between baleen- and toothed-species. <em>Jornal de Biologia e Neoplasia da Gl\u00e2ndula Mam\u00e1ria<\/em>, <em>2<\/em>(3), 205-230. https:\/\/doi.org\/10.1023\/A:1026328203526<\/li>\n\n\n\n<li>Slijper, E. J. (2021). Sobre alguns fen\u00f3menos relativos \u00e0 gravidez e ao parto dos cet\u00e1ceos. <em>Bijdragen Tot de Dierkunde<\/em>, <em>28<\/em>(1), 416-448. https:\/\/doi.org\/10.1163\/26660644-02801049<\/li>\n\n\n\n<li>West, K. L., Oftedal, O. T., Carpenter, J. R., Krames, B. J., Campbell, M., &amp; Sweeney, J. C. (2007). Efeito do est\u00e1gio de lacta\u00e7\u00e3o e gravidez simult\u00e2nea na composi\u00e7\u00e3o do leite na vaca <a class=\"wpil_keyword_link\" title=\"golfinho roaz\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"384\" href=\"https:\/\/futurismo.pt\/species\/bottlenose-dolphin\/\" target=\"_blank\" rel=\"noopener\">golfinho roaz<\/a>. <em>Jornal de Zoologia<\/em>, <em>273<\/em>(2), 148\u2013160. https:\/\/doi.org\/10.1111\/J.1469-7998.2007.00309.X<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>When it comes to whales and dolphins, there is usually some confusion. Are they fish? Are they mammals? But does it even matter what group these animals are in? Well, one thing is for sure\u2026 it does matter! As much as they can seem similar, fish and marine mammals have a lot of different features. [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":21721,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-21720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-wildlife"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Do whales &amp; dolphins lay eggs? | Scientific Approach [2026] \ud83d\udd2c<\/title>\n<meta name=\"description\" content=\"Do you know how cetaceans reproduce? Do whales and dolphins lay eggs? 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