请调整浏览器窗口大小或者请使用手机查看!
A blazing sun scorches the African savanna, where the planet's biggest bird protects his eggs and giraffes struggle to fuel their towering bodies.
Rocky Mountain summers are fleeting, leading local bears to gain weight, sharpen defenses and engage in a dynamic fight for domination.
In Borneo, apes and monkeys train their babies in the treetops, but with gravity against them, the stakes are high — and crocodiles lurk below.