Growth for the young birds is slow, and it is not until they are four months old — when they are also able to fly away from the nesting site — that they begin surviving on their own.
Jaunie putni aug lēni, un tikai četru mēnešu vecumā, kad tie jau ir spējīgi aizlidot no ligzdošanas vietas, tie sāk paši gādāt par sevi.