Grass coqui  The grass coqui or coqui de las hierbas (Eleutherodactylus brittoni) is a species of frog in the Eleutherodactylidae family, endemic to Puerto Rico. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, subtropical or tropical seasonally wet or flooded lowland grassland, plantations, rural gardens, and heavily degraded former forests. It is threatened by habitat loss.