A dozen geese homing to their summer nesting grounds.

１２只回到夏天筑巢地的鹅。

Hawksbills are endangered because their beachfront nesting grounds and coral reef feeding grounds are shrinking. Humans also target the turtles for food and shell products.

不仅因为海滨筑巢地与在珊瑚礁上的聚食处正在萎缩，也因为人们要吃它们的肉，把它们做成壳产品，所以玳瑁龟正面临着灭绝。

Migrating Sandhill cranes strut and dance for their partners before heading further north towards their nesting grounds.

在向北迁移到鸟巢前，沙丘鹤会趾高气扬地走路或者跳舞来吸引异性。

A study published last year revealed how the penguins depart their nesting grounds in February and head north on foot and ice floes to flee the protracted darkness of the Antarctic winter.

去年公布的一份研究报告显示，南极企鹅会在二月份离开筑巢地，依靠浮冰徒步向北进发，以避开南极冬天的极夜。