The function and evolution of the tail streamer in hirundines

By Louise V. Rowe, M. Evans, K. Buchanan. 2001

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Plumage coloration, not length or symmetry of tail-streamers, is a sexually selected trait in North American barn swallows (2004, background): “Evans (1998) and colleagues (Buchanan and Evans, 2000; Rowe et al., 2001) have determined that only a small proportion of the total length of the tail-streamers of European barn swallows (approximately 10–15 mm) is sexually selected, whereas the majority of the length of streamers confers naturally…”
On the cost of begging vocalization: implications of vigilance (2001, background): “This provides additional evidence for the involvement of both natural and sexual selection, in streamer evolution (Rowe et al., 2001).”