A Red-tailed Hawk soars on broad, rounded wings, the epitome of effortless flight. Without flapping, it traces a leisurely, rising circle. The hawk is riding a thermal, a column of warm rising air generated near the earth's surface by heat from the sun. The Red-tail periodically circles to…

Unlike mammals, birds have no external ear structures. Their ear openings are hidden beneath feathers on the side of the head, just behind and slightly below the eyes. (It's easy to imagine where this House Finch's ear is, isn't it?) In mammals, the external ear structure helps funnel…

Close kin to the Whip-poor-will, the nocturnal Common Poorwill can be heard in summer in the rocky scrublands of the West at the deep end of dusk. And the Common Poorwill's greatest claim to fame? It was the first bird confirmed to hibernate, based on evidence verified in 1946. Since then…

Pacific Golden-Plovers, known as Kolea, winter in grassy, open areas of the Hawaiian islands by the tens of thousands. The birds return each fall to the same patch. Kolea spend nine months in Hawaii, but by late April, they form large flocks and head north, over the Pacific Ocean to, as…

In the American West, there are two species of phoebe that share the same expansive country. But they occupy different habitats. The Say’s Phoebe prefers dry, open country ranging from tundra to desert. This Black Phoebe is a close cousin to the Say’s. But it is nearly always hunting…

Ever wonder how the avian idiom, “A little bird told me,” came about? The consensus is that the saying springs from the Old Testament of the Bible -- a maxim from Ecclesiastes. By the mid-16th century, the “little bird” showed up in collections of proverbs. In 1711, the satirist Jonathan…

In late July, the Great Horned Owl chicks that we have been following are four and a half months old, and must fend for themselves much of the time. The young birds continue to learn valuable lessons by watching the adults hunt. Their first hunting forays were clumsy. But by late July…

Kentucky Warblers nest in forested regions in much of the East, preferring woodlands with a dense understory, often near streams or other wetlands. These birds can use our help. As their forest habitat shrinks, it’s easier for Brown-headed Cowbirds to find and parasitize the warblers’…

Black-headed Grosbeaks are one of very few birds that regularly eat Monarch butterflies. Most birds and other animals find the butterflies unpalatable, if not downright toxic. The caterpillars of Monarchs consume milkweeds that contain toxic substances known as cardenolides. The poison is…

As an old tale goes, after the eagle was chosen for national emblem, Benjamin Franklin questioned the choice. In a letter to his daughter regarding a medal created by the Society of the Cincinnati, he wrote wrily: "The Bald Eagle is too lazy to fish for himself; when the Osprey has taken a…