Conservationists believe there may be a ray of hope for one of the rarest tree frogs in the world found in Costa Rica.
They have discovered that a frog that has not been seen for 20 years is in fact breeding in Monterverdes Cloud Forest Preserve.
Here, Andrew Gray, from Manchester University, shows the male Isthmoyla rivularis that has just been found.
The discovery was filmed by the BBC, which has been following the team from Manchester University and Chester Zoo as they work on conservation programmes for rare frogs.
Additional footage courtesy of Alexander Villegas