Bats also know how to use hearing aids

Small bats in central and southern America use rolled leaves to make hearing aids to improve their hearing.

Bats gathering inside the leaf roll act as stethoscope - Photo: Gloriana Chaverri)

This is the first time that experts have discovered the 'way' of hearing aid with 'stethoscope' in nature.

This behavior has been observed in disc-shaped bats , distinguished by sensory tubes on the arms and hind legs.

These small bats, weighing only about 4g, are often found nesting inside leaves such as Heliconia or Calathea, in groups of 5 or 6.

The leaves of these plants remain in a rolling state for only a day before they hatch, and then the bat is forced to find new homes, according to National Geographic.

While studying the bat species, biologist Gloriana Chaverri and Erin Gillam of Costa Rica University found that calls originating from the outside of the leaf can be exaggerated to 10 decibels.

This means that the bat in the leaf can hear sounds from 20 to 30 meters away, according to a report published in the Proceedings of the Royal Society B.