Some species of marine planaria (for example, Jungia) have a bright and prominent body color among algae.

Some species of marine planaria (for example, Jungia) have a bright and prominent body color among algae. But the fish, which usually eat other worms, do not touch the planarian. Why?

In the animal and plant world, bright coloration is often a sign of danger (for example, poison). That is why fish perceive marine planaria as a danger and do not touch them.



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