They are mostly nocturnal, preferring to spend the day tucked away below a leaf when they appear completely green. Their gaudy colours suddenly flash into life when they move, an off-putting surprise to a predator.
Costa Rica has many more frogs to offer, some just as colourful and astonishing - look for the Blue Jeans Frog for example (you’ll win no prizes for working out how it got its name).
The easiest places to see the commoner species are in captivity in ‘frog gardens’ around the country.