Protective jacket for immunity to stinging cells
Like all other clownfish, false percula clownfish tend to stay very close to home: they spend most of their time on, in or being protected by very special kinds of sea anemones, which are not generally known for being particularly friendly. The anemones tentacles are covered in poisonous stinging cells, which they use to stun fish and other small creatures before killing them. However, clownfish are unaffected by this poison; the anemones ‘recognise’ their tenants and do not deploy their stinging cells on them. This enables the clownfish to move freely between the tentacles, where they are protected against hungry predators.