The plip plop of tiny hopping feet.
Six new species of miniature frogs have been discovered in the forests of Mexico.
The species are so tiny that they fit on top of a British 50p coin with lots of room to spare. They are among the smallest frogs in the world and are no larger than 15 millimetres (0.6 inches).
They were undetected for so long due to their small stature, colouring and their similarity to existing species.
"These frogs live in the dark, humid leaf litter of the forests and we don't really know anything about what goes on there. We don't understand their behaviour, how they socialise, or how they breed," says Tom Jameson, a researcher at the University of Cambridge. Leaf litter is made up of dead plants or leaves that have fallen to the ground.
The species are not widespread across the country and are mostly found in pine-oak forests, in the Sierra Madre del Sur region in southern Mexico.
https://www.bbc.com/news/science-environment-62271380