这只雄性在交配期内不会离开海滩，因为怕自己被篡权夺位。

This male will not leave the beach during the mating season, for fear of being usurped.

假如它们来春的交配期再次相遇，它们就必须一战以赢得母熊的芳心。

If they meet again during the mating season next spring, they must fight to win access to females.

到了九月初，与北极苔原上所有的驯鹿一样，格兰特驯鹿也进入了交配期。

By early September, like all reindeer across the arctic tundra, Alaska's porcupine herd are entering the mating season.

但母鹿们，还尚未从疲惫的交配期缓过神来，它们就不得不在首次一同踏上这两千五百公里征途的那一刻就面临更多的危险。

But for the mothers, tired from the mating season, there are many dangers ahead as they set out on the two-and-a-half thousand kilometer journey. Together for the first time.

避开敏感时节：交配期、筑巢、育雏，或冬季。

Avoid wildlife during sensitive times: mating, nesting, raising young, or winter.

这些大树蛙大部分时间在高高的树冠层生活，只有在交配期才下来。

These large tree frogs spend most of their lives in the high canopy and only come down when it's time to breed.