This large swift occurs in the mountains of Mexico. It catches flying insects above forests and uses caves or cliff crevices for roosting and nesting.
It is dark brown with a white patch on the nape. Its wings are long and broad, and the tail is squared.
It catches flying insects above forests and mountains. Groups may nest in caves or use crevices in cliffs.
At Dos Bocas, Mexico, 26 of 32 nests examined in 1985 had constructed structures, mainly mud. Eleven of 12 examined for materials also included substantial vegetation, chiefly decayed leaves.
All nine nests on slanted substrates there had built structures; three of six on level or naturally enclosed sites had no constructed structure.
An extinction-risk assessment has not been added yet.