Crickets that dig exponential horns to broadcast pure song
Mole crickets—family Gryllotalpidae—are stout burrowers about three to five centimetres long with shovel forelegs and tiny eyes. Males sing from tunnels flared like exponential horns, pushing nearly pure tones into the night air to draw females for mating or egg sites.
Life stays mostly underground through eggs, nymphs, and adults, though winged adults disperse in breeding season. Diets split by species: root-feeding herbivores, omnivores that add worms and grubs, and mostly predatory forms. Incomplete metamorphosis brings up to ten moults. After mating, females may wait one to two weeks, then dig as deep as thirty centimetres—seventy-two in lab trials—to lay twenty-five to sixty eggs. Some adults roam eight kilometres in a season.
Gryllotalpa gryllotalpa sings near 3.5 kilohertz, vibrating soil twenty centimetres around the burrow. G. vineae polishes a two-mouthed tunnel with millimetre precision, a resonating bulb, and an escape shaft, then sings about half an hour after sunset for an hour—audible to six hundred metres. At one metre, mean cycle power can hit eighty-eight decibels with peaks near ninety-two; at the mouths, sound nears 115 decibels. A night-flying G. vineae female may hear a male thirty metres out, versus about five for a typical surface Gryllus.
The Latin name joins gryllus (cricket) and talpa (mole). Fossils are scarce: Cretaceous Cratotetraspinus from Brazil, Marchandia in French amber, plus Tertiary Baltic and Dominican finds. Pygmy mole crickets are unrelated grasshopper-line insects—convergent digging gear, not kin. Loudness tracks male size and habitat quality; the noisiest singers may pull twenty females in an evening, which also lets researchers trap arrivals by blasting recorded song.
Source: Mole cricket
