1.Hatchlings are simply too small to conserve body heat,even with insulation and countercurrent exchange systems. 刚孵出的小海龟太小了，即使有保温和逆流交换系统，也无法保持体温。 2.The leatherback is certainly not the only animal ...

Female Silver Appleyard domestic duck standing in shallow water with a small patch of snow behind© Jon Moorby/Shutterstock.com Have you ever watched a bird wading in icy water and flinched? How can ...