Frogs in Puerto Rico croak at a higher pitch due to global heating

The call of the coquí frog is well known to most who have spent time in Puerto Rico. Photograph: Geordie Torr/Alamy

Frogs in Puerto Rico are croaking at a higher pitch due to global heating, scientists have found.

The frogs appear to be decreasing in size at warmer temperatures, which causes their croaks to become high pitched. If the trends continue, the heat could become too much for the sensitive amphibians to survive successfully, researchers have said.