And they have another reason to keep moving. 他们继续前行还有另一个原因
The fox will have to find its meal elsewhere. 赤狐只能去别处觅食
Yet Nubian ibex have made this their home. 而努比亚羱羊还是栖息于此
they have had to adapt both their body and their behaviour in order to survive. 为了生存 他们必须从体型和行为上 充分适应环境
the penguins have to risk their lives. 这些企鹅得冒着生命危险
that few humans have even set foot on them. 以至于几乎没有人类踏足
Of all the species that have become extinct in recent years, 近年来濒于灭绝的物种之中