I know some do, but I don't know if that applies to all species.
Baby barn swallows typically fledge, or take their first flight, at about 18 to 23 days old. During this time, they develop the necessary wing strength and coordination for flying. After fledging, they continue to refine their flying skills while being cared for by their parents for a short period.
pakistan
QUAD
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.