By the numbers: In the past 50 years, Colorado species like the mountain plover and Baird's sparrow have seen population ...

Spring’s arrival and warming temperatures will soon bring flocks of people outdoors in Colorado ... birds crossing and 2,600 ...

first-year birds resemble an adult female, but they tend to be buffier. Juvenile: brown and streaked, it acquires the red cap in the late summer molt. Great care is needed to separate the common ...