Red-tailed Hawks typically have a nesting territory of about a half-mile to a full square mile, depending on how much food there is. Bald Eagles’ nesting territories range from 2½ square miles to as much as 15 square miles, for the same reason. But the Gyrfalcons in Finland and Scandinavia…

The challenge of learning which gull is which brings to mind a crossword puzzle. Take in all the clues, and come up with the right answer. For identifying gulls, we recommend a good bird book, binoculars, perhaps a thermos of hot coffee, and maybe a chair. So which gull is this? Large gull…

Every year, hundreds of bird species migrate between North and South America. Some species likely evolved from ancestors that moved north in search of new breeding habitats: the “southern home” hypothesis. But others may have extended their winter ranges south: the “northern home”…

In the tidal marshes of the East Coast, the Saltmarsh Sparrow has a breeding strategy described by scientists as featuring an “obligate, promiscuous, and bond-free relationship between males and females.” That means both sexes copulate with multiple individuals, without a lasting…

As the colder months arrive, birds that remain in northern climates face the harsh realities of staying warm and finding food. Some birds approach the food problem by storing it in advance — a behavior called caching. Chickadees, nuthatches, jays, and some woodpeckers are known to cache…

The American Wigeon is a grazer. Its bill is narrow, with a pointed tip like that of a goose. When feeding on water plants, a wigeon grabs a leaf and rips it off with its strong bill, rather than using the straining apparatus typical of dabbling ducks. Take a field trip with your local…

The White-throated Sparrow’s melancholy whistle is hauntingly beautiful. But when you hear an adult sparrow performing, just know that the bird wasn’t always an expert singer. In the fall, listen for White-throated Sparrows rehearsing their song. Inexperienced young birds sometimes begin…

University of Puget Sound professor Peter Hodum studies seabird conservation. And he says that if you can’t do something to address a problem, find someone who can.

Due to trapping for the pet trade, the talkative and showy Yellow-crested Cockatoo is now considered critically endangered. But scientists recently discovered a stronghold for the species: Komodo Island — yes, the one with the dragons. The Komodo population of Yellow-crested Cockatoos…

In autumn, hundreds of thousands of Swainson's Hawks migrate to South America. With the help of a satellite tracking device, let's follow an individual male. On September 14, he leaves his breeding territory near Hanna, Alberta; reaches southwest Saskatchewan by September 23; passes…