Jim Ryan wrote: "... There is a mention of the fact that swifts sleep while they are flying...Does anyone know do that all the time and if they also roost?"
I assume our swifts land each night but, according to Borrow and Demey, the old world Common Swift is "presumed to remain on the wing, even for roosting, during [its] entire sub-Saharan stay", so more than 6 months... Steve Greenfield Minneapolis tapaculo at halcyon.ws
