Incubation, the act of providing proper physical conditions for the development of certain living organisms. The eggs of birds are incubated from the time the eggs are laid until they hatch. Most birds incubate their eggs naturally, by sitting on them in the nest to keep them warm and moist. Poultry farmers usually incubate eggs in large devices called incubators. The incubating period for eggs of chickens is about 21 days; of turkeys 28 to 30 days; of geese 30 to 35 days.
Mockingbird is a bird related to the catbird and thrasher. Its natural song is a series of clear, varied notes, usually repeated several times, but it is named for its ability to imitate the songs of other birds is and even the mewing of cats.
Sharks have been around longer than the dinosaurs. After a few hundred million years, it's humans that might kill them off.