They depend on their moms to drop worms in their little open mouths for as long as two years, which is a really long time in the life of a bird.
在长达两年的时间里 它们完全依赖妈妈来喂它们虫子 来喂它们虫子， 而两年对于一只鸟的生命来说是非常长的一段时间。