Wei-Assipu-tepui
[2] The various rock cavities of Wei-Assipu-tepui are home to nesting colonies of white-collared swifts (Streptoprocne zonaris) and oilbirds (Steatornis caripensis).[3] For the latter species, Wei-Assipu-tepui is the easternmost recorded locality in mainland South America, and the first known nesting site in Brazil.[3] The mountain's summit supports a greater variety of herpetofauna than the less vegetated plateaus of nearby Roraima-tepui, Kukenán-tepui, Yuruaní-tepui, and Ilú-tepui.[1] Day temperatures of 17 °C (63 °F) have been recorded on the summit plateau, falling to 12 °C (54 °F) overnight, with slightly lower values in the more sheltered caves.[4] In the first expedition of its type to Wei-Assipu-tepui, an Italian–Venezuelan team of speleologists explored the mountain's summit plateau in July 2000, surveying four caves and several minor cavities.