Brown Creepers are tiny yet lanky songbirds. They have long, spine-tipped tails, slim bodies, and slender, decurved bills. They search for small insects and spiders by hitching upward in a spiral around tree trunks and limbs. To move to a new tree, they fly weakly to its base and resume climbing up. These birds breed primarily in mature evergreen or mixed evergreen-deciduous forests. You can find them at many elevations, even as high as 11,000 feet at treeline in the West. In the winter season, the species moves into a broader variety of forests and becomes much easier to find in deciduous woodlands. Sometimes creepers build nests in unusual places, such as behind window shutters, in or under roofs, inside fenceposts, or inside concrete blocks. They burn an estimated 4–10 calories (technically, kilocalories) per day, a tiny fraction of a human’s daily intake of about 2,000 kilocalories. By eating a single spider, a creeper gains enough energy to climb nearly 200 feet vertically. The oldest Brown Creeper on record was at least 5 years, 5 months old and was recaptured and rereleased during banding operations in Illinois.