6ebbba77_Marine_habitats__principles__Living_in_the_sea
[Factor] Electricity [Living on the land] Air is a perfect insulator (bad conductor of electricity). Static electricity loses its energy very quickly outside the body. It is impossible for animal senses to sense electric fields in air. [Living in the sea] 
Sea water conducts electricity about equally well as the salts inside the body. Transfer of electrical energy to the water is almost ideally matched. Some eels and electric rays can produce electric shocks that kill or stun prey. Others can sense the electric fields produced by working muscles, when nearby (sharks).
Marine habitats, principles
Living in the sea