The surprising structure of a shrub willow sex chromosome

Sex in plants can be befuddling. Most species are hermaphrodites, expressing both male and female gametes in one individual. But some, including shrub willow Salix purpurea, employ the evolutionary strategy we are far more ...

Willow tits survive best with support from a flock

Willow tits (Poecile montanus) generally reside in one territorial area throughout their adult lives. But brutal winters in the north kill off many of them. They aren't able to manage well on their own, and storing seeds ...

Songbirds set long-distance migration record

Researchers at Lund University in Sweden have studied flight routes to determine how far willow warblers migrate in the autumn. The results show that the willow warbler holds a long-distance migration record in the ten-gram ...

Birds' migration genes are conditioned by geography

The genetic make-up of a willow warbler determines where it will migrate when winter comes. Studies of willow warblers in Sweden, Finland and the Baltic States show that "migration genes" differ - depending on where the birds ...

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