A single, white, elongated egg was laid per nesting ... were too few to reestablish the species. The passenger pigeon's technique of survival had been based on mass tactics. There had been safety in ...

The passenger pigeon was once the most numerous bird in the world. In the mid-1800s, billions of these birds were flying over the forests of eastern North America. Yet in just half a century, they’d ...

The smallest bird in the grouse family ... until there's no more room to rise. And since the white-tailed ptarmigan is an “indicator species” for high-elevation ecosystems — the canary in the alpine — ...