Evolution

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seahorse skeleton

The long flexible tails of seahorses (dye-stained skeleton of Hippocampus capensis shown) are made of square segments and are one of the rare exceptions to the round tails of many other animals.

Macrostomum hystrix flatworm

If there’s no other flatworm around for mating, a tiny translucent Macrostomum hystrix flatworm will inject sperm into its own head or any other convenient body surface. 

Australian bearded dragon

WHEN DRAGONS OVERHEAT  Australian bearded dragons are the first reptiles discovered to change sex in the wild due to overheating, raising questions about how they will cope with climate change.

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