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Also known as Cetaceans, cetaceans

Cetaceans are marine mammals belonging to the infraorder Cetacea (), a secondarily aquatic clade under the order Artiodactyla that include whales, dolphins, porpoises and extinct groups such as Basilosaurus. Most cetaceans live in marine environments, particularly the pelagic zone, but some reside solely in brackish or fresh water. Having a cosmopolitan distribution, they can be found in some rivers and all of Earth's oceans. Many species migrate seasonally over vast ranges for food advantages.

AI overview

Cetaceans are marine mammals that include whales, dolphins, and porpoises, living in oceans worldwide and in some rivers and freshwater habitats. They matter because they are a major group of large aquatic animals that migrate across vast distances and play significant roles in their marine ecosystems.

AI-generated from the Wikipedia summary — may contain errors.

Species

whales, dolphins and porpoises

Cetacea

ORDER

KingdomAnimalia
PhylumChordata
ClassMammalia
OrderCetacea

Habitatmarine, brackish, freshwater

Observations0

Observations recorded3,161,144

賞鯨, 瓦尔德斯半岛 (阿根廷) 鲸下目（学名：Cetacea）旧称鲸目，是偶蹄目的演化支之一，包含了大约八十种大型的有胎盘海洋哺乳動物，即鯨魚﹑海豚和鼠海豚。鲸下目的现存物种可分为两个小目：须鲸（Mysticeti）和齿鲸（Odontoceti）。根據化石相關資料，鲸魚和陸生哺乳動物(河馬)有共同的祖先，是五千萬年前的海洋動物。遠古鯨魚擁有四肢及尾巴，與爬行哺乳類無異。現今鲸魚為哺乳動物中最適應水中生活者，體形成流線型，前肢為鰭，後肢已退化，後肢與脊椎骨並不相連且隱入身體內。鲸下目中的一些動物以其高智商（英语：Cetacean intelligence）聞名。美國科學促進會2012年在加拿大溫哥華的大會中，與會者重申對於鯨類動物權利法案的支持，此權利法案將鯨類動物列為「非人類的人」（non-human persons）。鯨類動物一胎只有一隻，生長期長，又因為其經濟價值遭到人類獵殺，2008年的研究指出四分之一的鲸鱼及海豚受到绝种威胁，其中有9个品种已經到濒危或极度濒危的程度。

via GBIF