海牛鲸（学名：Odobenocetops）是一种已经灭绝的古代鲸鱼，属于海牛鲸科，生活在上新世。海牛鲸拥有2根獠牙，在一些化石中，其中一根会比另一根还要长。巨牙鲨可能会捕食海牛鲸。
与鲸类和海牛这些海生哺乳动物不同，鲨鱼的皮肤不会附生海藻或藤壶，这可能要归结于其皮肤上被称之为“肤齿”的微小鳞屑。
Unlike the skin of whales and manatees, shark skin doesn't pick up algae or barnacles. This seems to be due to little scales called "dermal denticles."
伯利兹大堡礁是世界上最多样化的珊瑚礁生态系统。它是鲸鲨、鳐鱼、海牛以及鲟鱼、海螺和多刺的龙虾们的栖息地。
The Belize Barrier reef is one of the most diverse reef ecosystems in the world, home to whale sharks, rays, and manatees as well as sturgeon, conch and spiny lobsters.
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