The sylviid warblers are a group of small insectivorous passerine birds. Gnatcatchers are a group of small insectivorous passerine birds. Skinks are generally carnivorous and in particular insectivorous. It is predominantly insectivorous but also carnivorous. The family Sylviidae is a group of small insectivorous passerine birds. Dilambdodont molars are present in shrews, moles, and some insectivorous bats. The flycatchers and chats are small, mainly insectivorous birds. Small insectivorous mammals eat prodigious amounts for their size. Cettiidae is a family of small insectivorous songbirds. This group includes seven species of largely insectivorous grassland birds. The first insectivorous (vertebrates) were amphibians. A Spanish study compared that genus with the insectivorous firecrest and "Phylloscopus" warblers. Only insectivorous bats occur in the Great Basin. There are 15 python species and 31 species of insectivorous blind snake. They are common among insectivorous birds, but are also found in some non-insectivorous species.