And I will give you one guess what is the cause:
"Scientists have found a disproportionate number of males to females on the mountaintops in the Northeast, with sometimes two or three males feeding chicks at the nest.
In the Caribbean habitats, researchers found that males and females are choosing different places to winter. The vulnerable species has an estimated population of 100,000 worldwide. The migratory birds nest and breed in coniferous forests in northern New England, the Adirondacks, and eastern Canada, then fly south to spend winter in the Caribbean.
--more--"
Yup, you guessed it! The birds are gang-banging because of.... climate change!
Look who delivered the baby!
Also see: Friday's Flight