Swallows in migration

In the past, the destination of the swallows in the autumn was a

As White could not verify what happened to the swallows, he made.....

Despite knowing that swallows migrate, we are still left with..........

Sometimes, swallows have been known to return not just to the same area, but even to the.....

Birds that travel by night can find their way using the.........

Bird navigation appears to be connected with the memory of.........