Teacher pack: Warm-blooded and cold-blooded animals: endotherms and ectotherms

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Teacher guide

Enrichment

An original supplementary PanduanHewan resource; not an official module or specialist teacher review.

Goals

Students can tell endotherms and ectotherms apart by the source of their body heat.
Students can explain, with examples, why "cold-blooded" is a misleading term.
Students can explain how ectotherms and endotherms control their body temperature, using Indonesian animals as examples.
Students can use the terms endotherm, ectotherm, homeotherm and poikilotherm correctly.

Materials

Animal picture cards
Heat-transfer diagrams
Paper and pencils
Worksheet

Suggested timing, adaptable by the teacher

11 minutes introduction · 38 minutes activity · 14 minutes discussion · 7 minutes reflection (70 minutes).

Temperature diagram (20 minutes): study pictures of a lizard in sunlight and shade; add arrows showing heat transfer.
Picture model (20 minutes): compare diagrams of a mammal with and without a hair layer; explain its role using the reading.
Observation from a distance (15 minutes): watch house geckos, lizards or birds around the school without going close or touching them, and record whether each animal is in the sun or in the shade.
Term cards (15 minutes): students match cards for endotherm, ectotherm, homeotherm and poikilotherm with their meanings and example animals.

Suggested formative rubric

Teachers may adapt this. Score each criterion 0 (not yet shown), 1 (partly) or 2 (clear); the 0–6 total is not an official passing standard.

Concepts match the reading.
Reasoning is supported by an example or evidence.
Can revise an answer and identify uncertainty.

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

Name / class / date (complete on paper):

Reading

Warm-blooded animals (endotherms) make their body heat from their own metabolism; examples are mammals and birds. Cold-blooded animals (ectotherms) mainly use heat from their surroundings; examples are fish, amphibians, reptiles and most invertebrates. An ectotherm's blood is not always cold, and ectotherms can still control their temperature through behaviour.

Endotherms (warm-blooded animals) make their own body heat by metabolism; mammals and birds are endotherms.
Ectotherms (cold-blooded animals) mainly use heat from their surroundings; fish, amphibians, reptiles and most invertebrates are ectotherms.
"Cold-blooded" is a misleading term, because the blood of a basking snake or Komodo dragon can be warm.
Ectotherms control their body temperature through behaviour: basking, seeking shade, soaking in water or retreating into burrows.
Endotherms need more food than ectotherms of a similar size, because making body heat takes energy.
There are exceptions, such as the leatherback turtle, which stays warmer than the sea, and the echidna, which has a low body temperature.

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.

Animal	Your answer
Sumatran orangutan
Barn owl
Dugong
Komodo dragon
Saltwater crocodile
Whale shark
Asian common toad
Leatherback turtle
Western long-beaked echidna
Asian honey bee
Human

Activity 2

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

Reflection

What do you feel and do when it is very hot or very cold? Is that more like an endotherm or an ectotherm?

Which fact most changed what you thought about cold-blooded animals?

Why should we only watch geckos, lizards or snakes from a distance?

Answer key — for teachers

Separate this section from pupil copies. Page numbers depend on print settings.

Activity 1

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

Activity 2

What is the main difference between endotherms and ectotherms? — Where their body heat comes from. Endotherms make heat by metabolism; ectotherms mainly use heat from their surroundings.
Why is "cold-blooded" a misleading term? Give one example. — 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.
Name two ways crocodiles control their body temperature. — Soaking in water when hot, and basking on rocks when cold. Crocodiles also often gape, which slows the heating of the head.
Why do endotherms need to eat a lot? — Because making and controlling their own body heat takes a lot of energy, and that energy comes from food.
Name one animal that does not fit the warm-blooded and cold-blooded groups, and explain. — 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).

Sources and updates

2026-10-02

PanduanHewan.org · May be copied for non-commercial teaching with attribution.

https://panduanhewan.org/en/learn/warm-blooded-and-cold-blooded-animals/