This photo of a lake sturgeon (Acipenser fulvescens) shows its protrusible, or extendable, mouth, with which it sucks larvae and other food animals from the bottom of the lake, river, or stream in which it lives.
This photo of a lake sturgeon (Acipenser fulvescens) shows its protrusible, or extendable, mouth, with which it sucks larvae and other food animals from the bottom of the lake, river, or stream in which it lives.