Wildlife Observations Background Information. Mammals Mammals are endothermic – Endothermic –...

download Wildlife Observations Background Information. Mammals Mammals are endothermic – Endothermic – They produce their own body heat. They are vertebrates (they.

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Birds Birds are endothermic vertebrates that lay eggs. They have feathers and wings (not all birds have feathers), hollow bones (to be light), and most can fly. Often birds’ distinctive calls can be heard before they are spotted. They usually have well- constructed nests. Look for their not-so-solid, white or green/brown scat on sidewalks, on buildings, near nests, etc…