By Inc. Encyclopaedia Britannica
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Extra resources for Britannica Illustrated Science Library Birds
Blood Circulation IMPERIAL SHAG Phalocrocorax atriceps This great coastal diver has solid bones and strong swimming feet. It does not oil its plumage so that it can better submerge. CORMORANT BILL Circulation of Saline Solution Fourth Toe Membrane Central Excretory Canal BROWN PELICAN Toe TOTIPALMATE FEET A characteristic of many marine birds. The posterior toe (hallux) is joined to the other toes by a membrane. It creates more surface area, and therefore more push, as the bird swims. Birds with this kind of foot walk clumsily.
Its flights are longer. Its diet is composed of 97 percent vegetables; the rest is made up of lichens and insects. EYE They are born with open eyes. GROWTH STAGES The chick keeps warm with the down that covers its body. It can walk and begins to be fed by its parents. 12-15 days Some species have shiny areas that can be seen even in the dark. 7 to 8 days Growth quickens, and the first covert feathers appear at the tip of the wing. The bird leaves the nest. Its diet consists of: 66% invertebrates.
1 CRACK IN THE EGG The chick turns inside until its bill targets the egg's midline. It then punctures the air sac. With a few more tries, it pierces the shell. The chick then breathes for the first time. 2 ASKING FOR HELP SEQUENCE OF PECKING The chick calls for its parents from inside. The reply encourages it to continue the effort. Between each sequence of pecking, the chick must take long breaks. THE CRACK EXPANDS After making a hole in the shell, the chick opens a crack with successive pecks at other points.