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Cold Blood (Ectothermic)
Body temperature changes with the environment
Blood moves slower in cold weather
Less oxygen is carried in the blood
Animal moves slower when it’s cold
Needs sun or heat to warm up and become active
Uses less energy (saves food)
Lives best in warm places
Cannot stay active in cold weather
Examples: snakes, frogs, fish, lizards
Called ectothermic animals
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Warm Blood (Endothermic)
Body temperature stays the same all the time
Blood flows well in all temperatures
More oxygen is carried in the blood
Animal stays active even when it’s cold
Can live in hot and cold places
Uses more energy to stay warm
Needs more food to make energy
Can run, jump, and fly anytime
Examples: humans, birds, lions, dogs
Called endothermic animals
Why might a lizard be sleepy on a cold morning but very fast in the sunshine?
If a frog and a dog were both outside on a snowy day, what do you think would happen to each one?
Why do cold-blooded animals often lie in the sun?
What could happen to a cold-blooded animal if it lived in a place that’s always cold?
Which animal might need to eat more food in winter: a snake or a lion? Why?
Can warm-blooded animals live at the North Pole? How?
Why don’t you see many reptiles like lizards and snakes during the winter in colder places?
What makes warm-blooded animals able to run or play anytime they want?
If you were designing a zoo, where would you put the reptiles so they stay healthy?
Can you think of a cold-blooded animal that lives in water? What helps it survive there?