Animal World, Factoscope by Saddleback Educational Publishing, Bookmatrix

By Saddleback Educational Publishing, Bookmatrix

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Bear, bats, ground squirrels, mouse lemurs, and European hedgehog, are examples of animals that hibernate during winter. Red-eared Terrapins Red-eared terrapins bury themselves in the mud at the bottom of a pond and hibernate in water. Internal Clocks It is believed that animals have an internal clock to break their hibernation period. 62 • The true hibernation results in a drop of heart rate. • The body temperature goes to 32° F in hibernation. • Hibernation lasts for several days or weeks. • The metabolism level of animals becomes very slow during hibernation.

They keep their skin dry with the help of shiny waterproof feathers. • 40 species of flightless birds exist today. • Flightless birds have small wing bones. • Ostriches use their claws as their weapons. • The Auckland island teal is a flightless duck. • Flightless birds have a flat breastbone. • Penguins can swim and spend most of their lives in water. • The cassowary has a helmetlike crest on its head. • Kakapo is the only flightless parrot that lives in New Zealand. 58 Evolution Flightless birds evolved from flying birds.

2 feet long. 8 inches long. • The guinea pig is an example of a domesticated rodent. 51 Whales W hales are of two type–toothed and baleen. Baleen whales have baleen plates in their mouths instead of teeth. They are very large in size. They are carnivores and eat shrimp and krill. Toothed whales are active hunters and feed on fish, squid, and marine mammals. Young Blue Whales Young blue whales drink about 50 –150 gallons of milk a day. Longest Migration Humpback whales travel the longest distance among mammals.

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