By Melissa C. McDade
Grzimek's scholar Animal existence source: Birds deals readers complete and easy-to-use details on Earth's birds. Entries are prepared by way of taxonomy, the technology in which residing issues are categorized into similar teams. every one access comprises sections on actual features; geographic diversity; habitat; vitamin; habit and copy; animals and other people; and conservation prestige. relations entries are by way of a number of species debts and a variety map and photograph or representation for every species. Entries finish with a listing of books, periodicals, and websites which may be used for additional study.
Each quantity of Grzimek's pupil Animal lifestyles source: Birds incorporates a pronunciation advisor for clinical names, a word list, an summary of birds, an inventory of species within the set by way of biome, an inventory of species through geographic position, and an index. The set has 640 full-color maps, images, and illustrations to liven up the textual content, and sidebars offer extra proof and comparable information.
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Additional info for Birds
An ancient family, species allow helpers to raise the young with Australian robins are more closely related them. The female builds a cup-shaped nest to Australian lyrebirds and honeyeaters. in the fork of a tree branch. Bark or lichen (LIE-ken) is often placed over the top of the nest in order to hide it from predators, animals that hunt them for food. The female lays one to three eggs and incubates them, or sits on them until they hatch, for fifteen to nineteen days, depending on the species.
This helps them judge distance as they swoop down on prey. Hearing Birds have a good sense of hearing—they can hear about as well as mammals. The sound goes in through a little opening near each eye. The holes are usually covered with feathers. They lead to the bird’s middle and inner ear, which are very sensitive to sounds. Because owls hunt at night, hearing is especially important to them. Some owls have a disc of stiff feathers on the face. The disc catches sounds, such as the squeaks of a mouse, and leads them to the ears.
Air moves in and out through hundreds of tiny holes in the shell. Waste from the developing chick is stored in a sac called the allantois (uhLAN-tuh-wus). The chorionic (kor-ee-AHN-ik) sac lines the inside of the shell, and the amniotic sac surrounds the chick. Time spent in the egg is different for each species, but for this chick, feathers have started to grow by Day 15, and the chick begins making noises by Day 19. There is a little egg tooth on the tip of the chick’s bill that it uses to break out of the shell on Day 21.