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.
Olfactory navigation
The Earth’s magnetic field is a potential map cue as the field varies in both strength and direction over the Earth’s surface Manipulations of the ambient magnetic field are rather difficult, although Keeton (1971) and Ioalé (1984) did report that magnets caused disorientation in pigeons when they were released under total overcast. This first indication for magnetic compass orientation in homing was later supported by other studies, which reversed the field around the head of the pigeon using battery operated coils. Though the coils had little effect in clear conditions, their effect under overcast conditions was dependent on the direction of the current. Another observation consistent with the idea of a geomagnetic map is the shift in the initial bearings of pigeons that occurs when the field increases during magnetic storms. In magnetic anomalies too, pigeons are disoriented, even under sunny conditions.