After years of research, experts have produced data that demonstrate unusual social nesting among hummingbirds.

Hummingbirds are so fiercely territorial that fights between them are sometimes fatal. But one unusual species is living amicably in colonies in the Andes.

He noted 23 adults and four chicks of the hummingbird species Oreotrochilus chimborazo ... he argues that colonial animals show partnerships that involve working together to help each other ...