The ibex choose the steepest cliffs to raise their young, 羱羊选择在最陡峭的绝壁上养育幼仔
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
With a head bob of acknowledgement, their mother now leaves. 点头示意之后 他们的母亲出发了
Everything will be fine, as long as their father comes back soon. 只要父亲尽快回来 情况就会好转
Their survival depends on their father returning with their next meal. 生存与否取决于它们的父亲 能否带着食物归来
the penguins have to risk their lives. 这些企鹅得冒着生命危险
When migrating red crabs march into their territory, 当迁徙的红蟹经过它们的领地时
provide their young with a rather less precarious start in life. 小鸟的幼年过得安全一些