What Are Adaptations?

An adaptation is a special feature or behaviour that helps a living thing survive in its environment. Adaptations develop over many generations. There are two main types.

Structural Adaptations

Physical body features that help an organism survive.

Platypus bill -- Detects electrical signals from prey underwater
Kangaroo tail -- Acts as a balance and a powerful third leg
Echidna spines -- Sharp quills protect it from predators
Eucalyptus thick bark -- Protects the tree from bushfires

Behavioural Adaptations

Actions or behaviours that help an organism survive.

Koala sleeping 20 hours -- Conserves energy on a low-nutrient diet
Whale migration -- Humpback whales travel from Antarctica to Queensland to breed
Frilled-neck lizard display -- Flares its frill to scare predators
Possum nocturnal activity -- Hunts at night to avoid daytime predators and heat

Did you know? Australia has been isolated from other continents for millions of years. This is why we have so many unique animals found nowhere else on Earth, like koalas, wombats and platypuses. They adapted to Australia's specific conditions.

Australian Animal Adaptations

Australia's harsh environments -- hot deserts, dense rainforests and dry bushland -- have led to some remarkable adaptations.

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Red Kangaroo

Structural: Large hind legs for hopping across vast distances. Behavioural: Licks its forearms to cool down in the heat.

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Saltwater Crocodile

Structural: Eyes and nostrils on top of its head to see and breathe while submerged. Behavioural: Lies still for hours to ambush prey.

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Koala

Structural: Rough pads and sharp claws for gripping smooth eucalyptus bark. Behavioural: Sleeps up to 20 hours to conserve energy.

Australian Plant Adaptations

Plants cannot move to find water or escape fire, so they have developed remarkable structural adaptations to survive Australia's tough conditions.

Fire Adaptations

Eucalyptus -- Thick, insulating bark protects the trunk from fire; new shoots grow from the trunk after burning
Banksia -- Seed pods only open after fire, releasing seeds into freshly cleared soil

Drought Adaptations

Spinifex grass -- Curled leaves reduce water loss in the desert
Bottle tree -- Stores water in its swollen trunk for dry seasons

Camouflage: A Special Adaptation

Camouflage is when an animal's colour, shape or pattern helps it blend in with its surroundings. The leaf-tailed gecko of Queensland looks exactly like a piece of bark, making it nearly invisible to predators. The tawny frogmouth bird looks like a broken tree branch when it sits still with its eyes closed.

Key Vocabulary

Adaptation

A feature or behaviour that helps a living thing survive and reproduce in its environment.

Structural Adaptation

A physical body part or feature that helps an organism survive (e.g. sharp claws, thick fur).

Behavioural Adaptation

An action or behaviour that helps an organism survive (e.g. migration, hibernation, nocturnal activity).

Camouflage

A type of structural adaptation where an animal blends in with its surroundings to hide from predators or prey.

Worked Examples

1

Is a kangaroo hopping a structural or behavioural adaptation?

Step 1: Hopping involves both body structure and behaviour.

Step 2: The kangaroo's large hind legs are a structural adaptation (a body feature).

Step 3: The act of hopping to travel efficiently is a behavioural adaptation (an action). Both work together.

2

Why do banksia seed pods only open after a bushfire?

Step 1: After a bushfire, competing plants have been cleared away.

Step 2: The soil is full of nutrients from ash, and there is plenty of sunlight.

Answer: By releasing seeds after fire, banksia seedlings have the best chance of survival with less competition, more nutrients and more sunlight.

3

How does camouflage help the tawny frogmouth survive?

Step 1: The tawny frogmouth has mottled grey and brown feathers that look like tree bark.

Step 2: When it sits still on a branch with its eyes closed, predators cannot tell it apart from the tree.

Answer: Camouflage helps the tawny frogmouth avoid predators by making it nearly invisible against tree branches.

Knowledge Check

Select the correct answer for each question. Click "Check Answer" to see if you are right.

Question 1

An echidna's sharp spines are an example of which type of adaptation?

Behavioural adaptation Migration Camouflage Structural adaptation

Question 2

Humpback whales travelling from Antarctica to Queensland each year is an example of:

Behavioural adaptation (migration) Camouflage Structural adaptation Hibernation

Question 3

Why does a koala sleep for up to 20 hours a day?

To hide from predators Because eucalyptus leaves have few nutrients, so it conserves energy Because it only eats at night Because it is too hot during the day

Question 4

Which Australian plant has thick bark to survive bushfires?

Spinifex grass Bottle tree Eucalyptus Wattle

Question 5

A leaf-tailed gecko blending in with tree bark is an example of:

Migration Hibernation Nocturnal behaviour Camouflage

Adaptations