The Chestnut-collared Swift catches flying insects above mountain forests and open areas. Males have a rufous collar; in females and young birds it may be incomplete or absent.
The male is mostly dark with a rufous collar. In females and immature birds, the collar may be incomplete or absent.
It forages for flying insects above forests and open areas in mountainous regions and may fly in social flocks.
At Yacambú National Park, Venezuela, it built moss-covered mud-and-vegetation nests on dark rock walls near small waterfalls.
At that park, 24 clutches held one or two eggs, averaging 1.83.
Three cases with exact dates at Yacambú each took 25 days from laying to complete hatching.
An extinction-risk assessment has not been added yet.