BIRDS Class Aves

Characteristics Integumentary Skeletal Feathers, bipedal (two legs covered in scales), syrinx (song box) Skeletal Endoskeleton; hollow bones; most can fly, large muscles for flight

Characteristics Circulatory Reproductive 4 chambered heart, 2 separate loops, complete separation of oxygen rich and oxygen poor blood Reproductive Internal fertilization, oviparous, amniotic eggs with hard outer shells Right atrium Left atrium Complete division Heart Domestic pigeon Left ventricle Right ventricle

Characteristics Nervous Respiratory Brain, adapted to quickly interpret signals, keen sight, good hearing, poor smell and taste Respiratory Lungs & posterior air sacs for gas exchange, air flows in a single direction, helps maintain metabolic rate

Characteristics Digestive Excretory Esophagus Crop Liver First chamber of stomach Gizzard Small intestine Cloaca Pancreas Air sac Kidney Heart Lung Brain When a bird eats, food moves down the esophagus and is stored in the crop. As digestion continues, the food moves through the intestines. Undigested food is excreted through the cloaca. Large intestine The muscular walls of the gizzard squeeze the contents, while small stones grind the food. Moistened food passes to the stomach, a two-part chamber. The first chamber secretes acid and enzymes. The partially digested food moves to the second chamber, the gizzard. Digestive Beaks that are adapted to type of food they eat, no teeth, crop, stomach, and gizzard Excretory Uric acid deposited in cloaca where water is absorbed

Characteristics Body Temperature Endothermic Habitat Land, migrate

Evolution Evolved from extinct reptiles

Groups of Birds Pelican & Relatives Birds of Prey Parrots Cavity-nesting birds Perching birds 6. Herons & Relatives 7. Ostriches & Relatives