How do platypuses detect their prey underwater?

Platypuses detect their prey underwater using electroreception. They have specialised receptors in their bills that can sense electrical signals produced by the movement of muscles in nearby animals. This allows them to locate prey, such as insects and small fish, even in the dark or murky waters. Platypuses close their eyes, ears, and nostrils while submerged, relying entirely on their sense of touch and electroreception to find food.