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Polygynandry and avian swingers

10,000 Birds

Many robins, eagles and finches later, he ended up at university studying various biology things and wrote a thesis on vertebrate biogeography in southern African forests. In the case of Acorn Woodpeckers, they are cooperative breeders (as with many other polygynandrous species), which seems to predispose species to polygynandry.

2011 217
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Combined Beats’ List – September

10,000 Birds

All birds are equal on this list; parking lot birds or pelagic species, breeders or fly-overs, all will be accorded the same status and each shall be worth 1 credit on the list. Crested Serpent-Eagle – Spilornis cheela. Black-breasted Snake-Eagle – Circaetus pectoralis. Brown Snake-Eagle – Circaetus cinereus.

2016 154
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Combined Beats’ List – August

10,000 Birds

All birds are equal on this list; parking lot birds or pelagic species, breeders or fly-overs, all will be accorded the same status and each shall be worth 1 credit on the list. Crested Serpent-Eagle – Spilornis cheela. Changeable Hawk-Eagle – Nisaetus limnaeetus. Black Hawk-Eagle – Spizaetus tyrannus.

2016 101