Number two is the leatherback turtle.

第二种是棱皮龟。

At least to the same degree as the modern leatherback turtle.

至少和现代棱皮龟一样。”

Leatherback turtles travel great distances every year, both to eat and reproduce.

棱皮龟每年都要长途跋涉，为了觅食和繁殖。

Also, the leatherback turtles, the largest turtles in the world, dive at the same depth.

此外，世界上最大的海龟——棱皮龟也潜到了同样的深度。

It was closely followed by the leatherback turtle, at 15Hz. Tuataras clocked in at 46Hz.

紧随其后的是棱皮龟，有15赫兹。

Like the name suggests, the leatherback turtle, unlike its harder-shelled cousins, has a softer shell that's leather-like to the touch.

像它的名字一样，棱皮龟与它的兄弟姐妹们的硬壳不同，它有着一个摸起来像皮革一样的柔软外壳。

These killer whales were seen killing sperm whales, pygmy sperm whales and large Risso's dolphins, as well as scavenging on leatherback turtles.

这些虎鲸捕杀抹香鲸、侏儒抹香鲸和大型里索海豚，并以棱皮龟为食。

As many as 60 percent of the leatherback turtles born in the western Pacific Ocean are believed to make the trip to California.

太平洋西海岸出声的棱皮龟中，有60%都迁徙到了加州。

The bones suggest the creature had a smooth shell similar to leatherback turtles, with the shell itself about 2.35 meters long and 2.2 meters wide.

这些骨骼表明，这种生物的壳很光滑，类似于棱皮龟，壳本身长约2。35米，宽约2。2米。

However one of these, the leatherback turtle, can grow to over two and a half meters in length and weigh close to a ton.

然而其中的一种，棱皮龟，可以长到超过两米半的长度，体重接近一吨。