The platypus hunts entirely underwater with its eyes, ears, and nostrils closed, relying on electroreceptors in its bill. These detect tiny electrical signals produced by the muscle contractions of prey. This allows hunting in complete darkness or murky water where vision is useless. They combine this with touch sensors to pinpoint movement in sand or gravel. Juvenile platypuses quickly learn to master this skill for survival. Electroreception is rare among mammals, giving platypuses a unique predatory advantage.
Electroreception enables hunting in environments other mammals cannot exploit.
It shows how sensory evolution can create ecological specialization.
Platypuses locate prey without seeing it underwater.
Smithsonian National Zoo (si.edu)