Jurassic Insect Calls Reconstructed

Researchers used fossilized stridulatory files (toothed chitin structures) and wing measurements from 20 Ensifera fossils from Inner Mongolia to model the wing vibrations and acoustic frequencies of Jurassic crickets and kin. The study finds calls ranged from ~5 kHz up to ultrasonic, and the authors propose mammalian predators shaped those acoustic adaptations. — Demonstrates that fossils can preserve behavioral signals (sound), opening a new empirical window into ancient ecosystems and the evolution of communication and predator–prey interactions.