I know some do, but I don't know if that applies to all species.
QUAD
pakistan
cows and dogs
There is not really any thing since they eat 'on-the-wing'. In other words they eat insects, mainly flying ones.
collapsing barns
By flying i suppose.
Owls are predators no animal eats owls . But barn owls do swallow their prey whole.
No, the barn swallow, Hirundo Rustica, is a very common species, in no way endangered.
they have wings
The only predator that stands a chance at catching a swallow or a swift is the falcon.
About 4 per nest.
Swallows eat mainly flying insects, including mosquitoes and other harmful species