Did you know clownfish have teeth? They’re not very sharp, but these territorial fish won’t hesitate to bite intruders nearing in their anemone abode. Researchers also discovered that clownfish use their teeth to communicate with conspecifics by producing a chattering noise.
Clownfish have a symbiotic relationship with Heteractis anemones. Each clownfish has a resident anemone. In this mutualism, clownfish have a protected shelter (the stinging anemone keeps predators away), and anemones also receive protection (clownfish are aggressive defenders of their anemone dwelling).