How Animals Warm Up and Cool Down

Compare temperature-control behaviors in warm-blooded and cold-blooded animals.

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Separate making heat, gaining heat, and slowing heat loss. Endotherms make substantial heat internally, but also use behavior. Ectotherms can regulate temperature by moving between warmer and cooler places; they do not simply stay wherever they get too hot or cold.

Worked example

A mammal's fur helps retain heat rather than acting as a heater. A lizard basking gains outside heat. These are different ways of affecting body temperature.

1. A lizard is cool in the morning. Which behavior can help it gain heat? Remaining in a colder shadow Basking in a sunny spot Avoiding all outside heat

2. A lizard is becoming too hot in the sun. Which move can help it cool? Moving to a cooler shaded place Staying on an even hotter surface Absorbing more sunshine

3. What is one way fur helps a mammal in cold conditions? It produces sunlight It removes the need for food It slows the loss of body heat

4. A dog moves into shade on a hot day. What does this show? Only ectotherms ever seek shade Endotherms can also use behavior to regulate temperature The dog has become cold-blooded

5. Which claim about ectotherms is incorrect? They can gain heat from outside sources Some bask to warm up They cannot influence their body temperature at all

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