Bat
Microbats make use of magnetoreception, in that they have a high sensitivity to the Earth's magnetic field, as birds do. Microbats use a polarity-based compass, meaning that they differentiate north from south, unlike birds, which use the strength of the magnetic field to differentiate latitudes, which may be used in long-distance travel. The mechanism is unknown but may involve magnetite particles.
Magnetoreception
Studies of magnetoreception in vertebrate fish have been conducted mainly with salmon. For instance, the presence of an internal magnetic compass has been discovered in Sockeye Salmon ("Oncorhynchus nerka"). Researchers made this discovery by first placing the young of this species in a symmetrical, circular tank and allowing them to pass through exits in the tank freely. A mean vector was then calculated to represent the directional preferences of these salmon in the natural magnetic field. Notably, when the magnetic field was experimentally rotated, the directional preferences of the young Sockeye Salmon changed accordingly. As such, researchers concluded that the orientation of swimming behaviour in Sockeye Salmon is influenced by magnetic field information.