This eight-armed cephalopod can rapidly change its skin colour and texture.

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NatureOne small aha

Your new ahaThe octopus.

Octopuses can change colour and texture using specialized skin structures. Source: Octopus ↗

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46Keystone species · explain the termRECALL
A species whose impact on its ecosystem is disproportionately large.
Removing a keystone species can change food webs and habitats in cascading ways.
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47Woodpecker's stiff tail · how it helps during climbing and peckingRECALL
Brace against a tree while climbing and pecking.
Woodpeckers combine stiff tail feathers with gripping feet and shock-absorbing anatomy.
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48A hermit crab commonly occupies this discarded hard covering for protection.RECALL
An empty shell.
Hermit crabs move into larger shells as they grow, though some species use other coverings.
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