Question: what is the difference between a barn swallow and a martin?
Answer: Swallows often perch on poles or wires to rest or preen. Swifts never do this as they are only capable of coming to rest on vertical surfaces. Barn Swallows (below) can be easily identified by their long, strongly forked tails. Purple Martins (right) are much larger than other swallows or Chimney Swifts.