Are there Swallows with uneven tails?

Question

Like one tail is longer than the other, but naturally across that entire species, not because the tail is damaged or has genetic problems. Thanks!

Answer 1

Yes

Anders Moller of Uppsala University has investigated tail symmetry in the male swallow (Hirundo rustica). He measured the long outer tail feathers of 96 male swallows, and noted whether they were symmetrical or uneven. He found that the shorter tails were also more uneven (Animal Behaviour, vol 40, p 1185).

http://www.newscientist.com/article/mg12...