Birds

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Birds

• 3/27/07
• How are birds related to mammals?

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(No Transcript)
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Birds

• Kingdom Animalia
• Phylum Chordata
• Class Aves
• Definition Endothermic, feathers, 2 legs with
  scales, front limbs are wings
• Example Parrot, blue birds, robins, cardinals,
  etc.
• Habitat Everywhere

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Physical Characteristics

• Endothermic, feathers 2 legs with scales, wings,
  hollow bones
• 2 types of feathers
• Contour feathersflight
• Down feathers warmth and waterproofing

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Feeding

• Very efficient digestive system
• Beak is adapted for food
• No teeth
• Mouth? esophagus? crop ? stomach? gizzard ?
  intestines? cloaca
• Gizzard part of stomach
• Some birds regurgitate food from crop to feed
  young

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Excretion

• Cloaca? reabsorbs water so waste becomes white
  paste
• Kidneys? filter waste from blood

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Respiration

• Efficient
• Air flows in 1 direction

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Circulation

• 4 Chambered heart
• 2 ventricles and 2 atrium
• Separate oxygen rich from oxygen poor blood

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Evolution

• Dinosaur with feathers
• First birdlike animal about 150 million years ago
  called Archaeopteryx

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Nervous System and Movement

• Brain large for body size
• Movement
• Walk, run, swim, and fly

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Response

• See color well
• Good hearing
• Not good taste and smell

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Classification

• Similar Characteristics

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Reproduction

• Amniotic egg
• Sex organs shrink until mating

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Defense

• Flight
• Singing
• Beaks

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Groups of Birds

• 30 different orders
• Most common passerines (perching birds)
• 5000 species perching birds
• Birds of prey
• Parrots
• Pelicans and relatives
• Cavity-nesting birds (woodpecker)
• Herons and relatives
• Ostriches and relatives