These frogs live in tropical or subtropical rainforests on mountains. Their eggs are large and scientists have seen many of them laying eggs on underwater objects in fast-flowing creeks and streams, enough that they think all "Nyctimystes" frogs do this. The tadpoles have large sucker-mouths and streamlined bodies with large, muscular tails. All "Nyctimystes frogs" have webbed feet and large discs on their toes for climbing.