and were self-sufficient from their first breath... 一出生就能自给自足

116. all wiped out when the forests burned.
     森林被烧毁时 全部灭绝
117. But a handful of ground-dwelling birds did make it through.
     但少数栖息在地面上的鸟类 幸存了下来
118. These survivors were kept warm by feathers...
     这些幸存者靠羽毛保暖
119. and were self-sufficient from their first breath...
     一出生就能自给自足
120. able to live on insects and seeds
     以昆虫和种子为食
121. and capable of walking within hours.
     而且出生之后几小时就能行走
122. Sixty-six million years ago,
     6600万年前

来自《我们星球上的生命 第一季 第六集 Life on Our Planet S01E06 灰烬中重生》第 119 行