By Inc. Encyclopaedia Britannica
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Additional resources for Britannica Illustrated Science Library Birds
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. The rest consists of seeds and flowers. 8 days Feathers cover the chick almost completely, except around its eyes.
The lamellae (small plates) catch the microorganisms but let water and other matter pass. Cross-Section of the Bill 2 THE HUMMINGBIRD'S TONGUE Long channeled or tubular tongues suck the nectar and catch insects at the bottom of the corolla of a flower. Few birds feed on leaves because they have low energy value. Birds that do have undergone adaptations that permit them to digest cellulose. FRUIT INSECTIVORES In the tropics, this diet is very common because fruits are available throughout the year.
Passerines have been classified into 79 families, with more than 5,400 different species. The bill of a swallow is very short and tough. The swallow can use it to catch insects in flight. This blue-and-white swallow (Notiochelidon cyanoleuca) intones its pleasant and trilling chant while it flies or when it alights. Larks, goldfinches, canaries, and other passerines delight us with their trills and sounds. SYRINX This sound-producing organ is located at the end of the trachea. The muscles in the syrinx move the bronchial walls, which, as the air passes through, produce the melodic sounds that characterize songbirds.