Sort Warm-Blooded and Cold-Blooded Animals

Use animal groups to compare warm-blooded and cold-blooded examples.

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Birds and mammals are endotherms, often called warm-blooded. Familiar reptiles such as lizards and turtles, amphibians, and most fish are ectotherms, often called cold-blooded. Use the animal's group, not whether its home is warm or cold.

Worked example

A dolphin lives in water but is a mammal, so it is warm-blooded. A goldfish also lives in water but is an ectotherm. Living in water does not decide the group.

1. A penguin is a bird. Which description fits? Cold-blooded because it may live near ice Warm-blooded (endothermic) Neither, because it swims

2. A frog is an amphibian. Which description fits? Warm-blooded because it can jump Neither, because it uses land and water Cold-blooded (ectothermic)

3. Which pair contains two warm-blooded animals? A bat and a sparrow A frog and a lizard A turtle and a goldfish

4. A lizard rests on hot desert sand. Does that make it warm-blooded? Yes, desert animals are all warm-blooded No, its main heat source is still external Yes, sand changes its animal group

5. Which statement is most accurate? Every animal in water is cold-blooded All fish regulate temperature exactly alike Most fish are ectotherms, but there are exceptions

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