By Peter Watson
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Extra resources for Animal Traction
Xliv Grzimek’s Student Animal Life Resource Birds’ bodies have adaptations for flight, including air sacs in the chest and hollow bones to keep them light, and strong chest muscles. (Illustration by Emily Damstra. ) Ulna Lung Air Sacs Muscle Subcutaneous Fat Deposit Skin Feathers Some long-billed birds have very sensitive bills and can feel their prey in muddy water. Smell and taste Most birds’ sense of smell seems to be poorly developed. But kiwis, turkey vultures, and several other birds are able to find food by sniffing it.
Java sparrows eat seeds; 10. Papuan frogmouths catch insects; 11. The bicornis hornbill eats fruit; 12. American anhingas spear fish; 13. Rainbow lorikeets crack nuts. (Illustration by Jacqueline Mahannah. ) WHAT’S INSIDE? Organs and muscles Birds have many of the same organs that humans have, but they have special features that help with flight and keep them light. Their biggest, strongest muscles control their wings. Birds xlvi Grzimek’s Student Animal Life Resource The number of toes, and the arrangement of their toes and feet fit birds’ different lifestyles.
This type of forest lacks ground vegetation because sunlight cannot penetrate through the canopy. Words to Know xxxv Promiscuity: Mating in which individuals mate with as many other individuals as they can or want to. Pupae: Plural of pupa; developing insects inside cocoon. Q Quill: Hollow feather shaft. R Rainforest: An evergreen woodland of the tropics distinguished by a continuous leaf canopy and an average rainfall of about 100 inches (250 centimeters) per year. Raptor: A bird of prey. Regurgitate: Eject the contents of the stomach through the mouth; to vomit.