Crickets are very similar to grasshoppers in that they have large hind legs for jumping, though typically they are much smaller. They are usually brown or black in color and are equipped with large antennae. They have a very recognizable chirp, usually occurring at night as they are nocturnal. A common belief is that the chirp sound comes as a result of rubbing their legs together, but it actually comes from stridulation, the act of rubbing the bottom of each wing together. The chirp frequency all depends on the weather, species and environment. Crickets are omnivorous, consume plant material and in dire situations they may other crickets. They are harmless to humans.