These pictures show the hatching sequence of a mousebird. After 17 days of incubation the first pip appears in the egg. The chick then rests for a while during which time the yolk sac continues to be absorbed. 15 hours before the chick resumed pipping.
Hatching proceeds rapidly once the chick begins to pip again.
During the active pipping period the chick stops to rest frequently. Occassional vocalizations can be heard. After 45 minutes the chick has pipped all the way around the shell and the top portion falls aside. After a brief rest the chick begins to push itself out off the bottom portion of the shell. Within a couple of minutes the chick is completely free of the shell and rests.