Bird Watching (UK) - - News Wire -

Swallows from dif­fer­ent parts of the world have dif­fer­ent views on what is at­trac­tive, a study led by the Uni­ver­sity of Colorado Boul­der has shown. Fe­male Swallows on both sides of the At­lantic seem to pre­fer a male with darker red feath­ers. But when it came to tails, Amer­i­can males with longer steam­ers left the fe­males cold, whereas the same trait was seen as de­sir­able by those Swallows who spent the summer in Is­rael. The re­sults could shed some light on the mechanics of spe­ci­a­tion.

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