Crickets mate in the spring. The eggs hatch in the fall and they usually hatch in groups of 2,000.
Crickets are known for their chirp (which only male crickets can do; male wings have ridges or "teeth" that act like a "comb and file" instrument). The left forewing has a thick rib (a modified vein) which bears 50 to 300 "teeth". The chirp is generated by raising their left forewing to a 45 degree angle and rubbing it against the upper hind edge of the right forewing. There are two types of cricket songs: a calling song and a courting song. Female crickets have a long needlelike egg-laying organ (ovipositor).
To hear the mating call of other crickets, a cricket has ears located on its knees, just below the joint of the front legs.
There are about 900 species of crickets. They tend to be nocturnal and are often confused with grasshoppers, which are related because they have a similar body structure including jumping hind legs.