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Unformatted text preview: a. systemic now separated to avoid mixing b. pulmonary of oxygenated and deoxygenated blood 5. Metabolic rate- high a. homoeothermic- “warm blooded” or “endothermic” 6. Excretion a. Uric Acid- advantage to urinary bladder, not holding water, makes birds lighter 7. Digestion a. Stomach- crop- thin walled, for storage- gizzard- thick walled, for grinding i. some birds eat pebbles to help grind 8. Reproduction a. Internal fertilization b. oviparous c. birds have to incubate eggs because warm blooded 9. Scales- on their legs a. remnants of reptilian ancestry b. feathers evolved from scales...
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.
- Spring '08