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Recently, scientists have found that one tiny species of frog that emits ultrasonic sounds that are inaudible to humans but can scare off predators
In their work, published in the journal Acta Ethologica earlier this year, Brazilian scientists from the Institute of Biology, São Paulo, and the Project Dacnis preserve recorded the ultrasonic ‘screams’ of the tiny leaf litter frog (Haddadus binotatus) while in the rainforest of Brazil.
Haddadus binotatus
Haddadus binotatus (common name: clay robber frog) is a species of frog in the family Craugastoridae.
Haddadus binotatus is a very common frog.
It inhabits primary and secondary forest and forest edges.
It is usually found in the leaf-litter on the forest floor, or on leaves in low vegetation inside the forest.
It is endemic to the Brazilian Atlantic forest and most dominantly found in the states of Rio de Janeiro and Espírito Santo
IUCN Red list status : Least Concern
No CITES Listing
Region Observed
The frog — which is smaller than an inch — while emitting the scream would raise the upper portion of its body, open its mouth wide, and throw its head back.
This behaviour was, they said, was a typical defensive movement against predators.
The frequency of the frog’s call spanned the 7 kHZ to 20 kHZ range, which is within humans’ hearing range, but also reached up to 20 kHZ to 44 kHZ, which is beyond what the human ear can discern
The "normal" hearing frequency range for human is between 20 Hz and 20,000 Hz(20kHZ)
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