Marine iguanas lay their eggs in sand.

海鬣蜥将蛋下在沙子里。

Although marine iguanas are expert swimmers, they can't cross open oceans.

尽管海鬣蜥是游泳的行家它们也无法横渡广阔的大海。

Their ancestors were more like the marine iguanas living on the Galapagos Islands today.

它们的祖先更像是今天生活在加拉帕戈斯群岛上的海鬣蜥。

But those species that have been studied are animals like marine iguanas, for whom knowing the tides is important.

被研究的动物对象包括海蜥蜴，潮汐对它来说非常重要。

They are vegetarians, but since there's little food for them on the land, marine iguanas graze on the sea floor.

它们是素食者但由于岛上没有能吃的食物所以海鬣蜥以海底的植物为食。

Out of about 12,000 reptile species, only around 100 are considered marine, including marine iguanas, sea turtles, saltwater crocodiles, and sea snakes.

在大约 12,000 种爬行动物中，只有大约 100 种被认为是海洋生物，包括海鬣蜥、海龟、咸水鳄鱼和海蛇。

It's possible that it did something like what we see in marine iguanas today, and had endosymbiotic bacteria in its gut that helped it digest its dinner.

它有可能做了我们今天在海鬣蜥身上看到的事情，并且在它的肠道中有内共生细菌帮助它消化它的晚餐。

Herbivorous marine tetrapods are very rare - there were just a handful in the Mesozoic and there are only a few alive today, with manatees and dugongs, marine iguanas, and green sea turtles being pretty much it.

草食性海洋四足动物非常罕见——在中生代只有少数，今天也只有少数活着，海牛和儒艮、海鬣蜥和绿海龟几乎都是。