Amphibians use scream inaudible to humans for self-defense against predators, new study suggests
Researchers in South America have recorded the use of ultrasound by a frog for defense against predators, a first in the region, shedding light on amphibian behavior.
The leaf litter frog (Haddadus binotatus) emits a distress call at frequencies that humans cannot hear but predators can.(photo credit: HENRIQUE NOGUEIRA)ByJUDY SIEGEL-ITZKOVICHUpdated: