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."

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。

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Manatees (also called sea-cows) actually look like giant underwater slugs.

实际上海牛看上去像巨型的水下鼻涕虫。

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