She, too, sings as she creates birds out of colorful beads. “I didn’t use to sing,” Pizarro said. “I was very submissive and ...

A male bird singing loudly from the top of a tree sends a message that he has claimed an area and that he is fit enough to risk announcing his presence to predators at the same time. The quality of ...

Birds aren’t distributed randomly across the globe. Instead, each habitat supports its own unique collection of bird species that have evolved to live there. Picture a deep green forest, an open ...