Loud and Jumper Friend, the Crickets. (10 Pics)

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Crickets, family Gryllidae (also known as "true crickets"), are insects somewhat related to grasshoppers, and more closely related to katydids or bush crickets (family Tettigoniidae) and Weta (families Anostostomatidae and Rhaphidophoridae). They have somewhat flattened bodies and long antennae. There are more than 900 species of crickets.The sound emitted by crickets is commonly referred to as chirping; the scientific name is stridulation. Only the male crickets chirp. The sound is emitted by the stridulatory organ, a large vein running along the bottom of each wing, covered with "teeth" (serration) much like a comb.

from:http://en.wikipedia.org/wiki/Cricket_%28insect%29