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Tree Swallow: Medium-sized swallow with iridescent blue-green upperparts and white underparts. The wings are dark gray and tail is dark and forked. Black bill, legs and feet. Swift, graceful flight, alternates slow, deep wing beats with short or long glides. Turns back sharply on insects it passes.
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Violet-green Swallow: Small swallow, dark, metallic green upperparts, iridescent purple rump. Face, sides of rump, underparts are white. Tail is slightly forked. Black bill, legs and feet. Swift, graceful flight, alternates several quick wing beats with long glides. Soars on thermals and updrafts.
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