1. Familiar when fleshless
Can you name some animals that look more or less the same with or without their skin and flesh on? Those which are instantly recognisable from their skeletons alone?
Crocodiles, penguins and seahorses spring to my mind. Can you think of any more?
What these unrelated animals have in common – and what sets them apart – is that their skin sits directly on bone, at least on the important bodyparts. But this comes about in different ways.