# Worksheet: warm-blooded and cold-blooded animals (with answer key)

> Printable worksheet: sort Indonesian animals into endotherms or ectotherms, explain how each controls its temperature, and check the key.

Source: https://panduanhewan.org/en/learn/worksheet-warm-blooded-and-cold-blooded-animals/ · Updated 2 October 2026 · English · Bahasa Indonesia: https://panduanhewan.org/id/belajar/lkpd-hewan-berdarah-panas-dan-berdarah-dingin/
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## Activity 1

Write whether each animal is an endotherm (warm-blooded) or an ectotherm (cold-blooded), then give one way it gets or keeps its body heat.

1. Sumatran orangutan
2. Barn owl
3. Dugong
4. Komodo dragon
5. Saltwater crocodile
6. Whale shark
7. Asian common toad
8. Leatherback turtle
9. Western long-beaked echidna
10. Asian honey bee
11. Human

## Activity 2

1. What is the main difference between endotherms and ectotherms?
2. Why is "cold-blooded" a misleading term? Give one example.
3. Name two ways crocodiles control their body temperature.
4. Why do endotherms need to eat a lot?
5. Name one animal that does not fit the warm-blooded and cold-blooded groups, and explain.

## Answer key

1. Sumatran orangutan: Endotherm; heat from metabolism, and hair helps keep it in
2. Barn owl: Endotherm; makes its own heat and keeps a fairly steady temperature
3. Dugong: Endotherm; a sea mammal that makes its own heat
4. Komodo dragon: Ectotherm; basks, and goes into a burrow when it is very hot
5. Saltwater crocodile: Ectotherm; soaks in water when hot, basks on rocks when cold
6. Whale shark: Ectotherm; its heat comes mainly from its surroundings
7. Asian common toad: Ectotherm; controls its temperature through behaviour, such as choosing where to be
8. Leatherback turtle: Ectotherm (reptile), but a fat layer and heat-exchanging vessels keep it warmer than the water
9. Western long-beaked echidna: Endotherm (mammal), but with a low (28–35 °C), less steady body temperature
10. Asian honey bee: Ectotherm (poikilotherm) as an individual, but it can make heat, for example in a hot ball against hornets
11. Human: Endotherm; sweats when hot, shivers when cold

- 1. Where their body heat comes from. Endotherms make heat by metabolism; ectotherms mainly use heat from their surroundings.
- 2. Because an ectotherm’s body can become warm. A basking snake is one example; Komodo dragons also regulate temperature by moving between exposed places and burrows.
- 3. Soaking in water when hot, and basking on rocks when cold. Crocodiles also often gape, which slows the heating of the head.
- 4. Because making and controlling their own body heat takes a lot of energy, and that energy comes from food.
- 5. Examples: the leatherback turtle (a reptile warmer than the sea), the opah (a fish with a warm body) or the echidna (a mammal at 28–35 °C).