The Vaux's Swift is a small, migratory bird known for its rapid flight and acrobatic aerial maneuvers. Measuring about 4.7 to 5.5 inches in length, it has a dark brown plumage and a distinctive forked tail. These birds are commonly found in North America, particularly during the summer months, where they nest in chimneys and other vertical structures. Vaux's Swifts primarily feed on insects, which they catch while flying. They are known for their remarkable roosting behavior, often gathering in large numbers at dusk to enter their nesting sites. Their population is closely monitored due to habitat loss and changes in urban environments.