Driven indoors by autumn's chill, however, flies go into slow motion. Most species that come inside are preparing to die or hibernate. One of the interesting activities you can observe is grooming. Despite their reputation as filthy creatures, flies are fastidious about their own bodies.
Flies groom frequently and carefully.
Dirt on a fly's wings will have the same effect as ice on the wings of an airplane. Dirt on any of the fine hairs covering the fly's body clogs it organs of smell. And because flies need keen vision to detect predators like spiders, they have hundreds of eyes massed in the two bulging sense organs in front of their heads, but no eyelids with which to clean them. THE MOVE Autumn is a time of migration. Animals ranging from dragonflies to whales are on the move.