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Thick-billed Vireo: Medium vireo, olive-green upperparts, brown or gray-brown iris, broken dull white spectacles, pale yellow underparts shading to white undertail. Wings brown with two white bars. Large, gray bill. Most often heard, not seen. Frequents dense undergrowth and thickets.
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Tamaulipas Crow: Small crow, shiny black overall with purple-tinted upperparts and duller purple to blue-green tinted underparts. Bill is small and short. Feeds on grains, fruits, insects, carrion, refuse, and eggs and young of other birds. Rapid direct flight with steady wing beats.
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Temminck's Stint: Small sandpiper with gray-brown upperparts and faint breast band and white underparts. Dark tail is long with white outer feathers; upperwings are gray-brown and have dark markings. Flight is swift and direct with rapid wing beats. Has a distictive, hovering display flight.
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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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Tricolored Heron: Medium heron, blue-gray upperparts, head, neck, wings, paler rump, white stripe on foreneck, white belly. Also has white plumes on back of head and rust-brown plumes on lower neck, back during the breeding season. Bill and legs are olive-brown. Direct flight on steady wing beats.
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Trumpeter Swan: Largest swan in the world, completely white but with head and neck often stained rust-brown from contact with ferrous minerals in wetland soils. Bill, legs, and feet are black. Feeds on aquatic plants. Strong direct flight on steady wing beats. Flies in straight line or V formation.
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Terek Sandpiper: Medium-sized sandpiper with lightly spotted gray upperparts, white underparts, and gray wash on upper breast. Eyestripes are dark. Bill is long, black with orange at the base and curved upward. Legs are relatively short and bright orange. Swift direct flight with rapid wing beats.
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