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.
2년여 동안 어미에 의존하여 조그마한 입을 벌려 벌레를 받아 먹는 걸로 밝혀졌는데요, 2년이면 새의 일생에선 대단히 긴 시간이죠.