In a new study, researchers used more than 5 million measurements from individual trees across much of eastern North America and showed the rate at which introduced species are spreading has increased ...

Hummingbird Central uses citizen science to track the annual migration of hummingbirds, using user-reported sightings to map their progress. As of April 17, hummingbirds have made it as far north as ...

Nation’s grassland birds, found in 14 states, have declined 43% since 1970, more than any other category, and are currently ...