Photo: wellcome images (flickr)
You may have heard that there are some animals with senses we don’t have. How can that be?
The answer is that senses detect energy and chemical substances in an animal’s environment, and in some environments forms of energy are present that aren’t present in ours. Since water is much better at conducting electricity than air is, electric fields spread through water, but not air. Some aquatic animals can detect this electrical energy with a special sense.
Whenever muscles contract, they generate electrical signals. In dark and murky waters, predators with an electric sense can use these tell-tale signals to find their prey. Sharks, skates, rays and some bony fish have an electric sense, and a few aquatic mammals, like the platypus and some dolphins do too.
Some bony fish even actively generate an electrical field that surrounds the fish’s body. Nearby objects distort the field. The electric fish can detect these distortions and use them to sense its surroundings.