The red crossbill is aptly named. The bird is red, from brick to bright, and its bill is crossed. The latter is an adaptation, shared only with its close relative, the white-winged crossbill. Both of ...

In the pine forests of Idaho, a bird called the South Hills crossbill is waging one seriously bizarre evolutionary war. Over the last 5,000 years or so, the crossbill---so named because the two halves ...