Sylviidae - Old World warblers, gnatcatchers
 There are around 282 species of Old World warblers. They are small to medium-sized birds between 3.5-10 inches in length. They have slender bills; medium-sized, rounded wings; short tails; and short to medium legs. They are usually brown, gray, or olive in color with some streaks and bars. Some species are more boldly patterned. Most species are found in Europe, Asia, and Africa. They live in forests, brushlands, and marshes. Most of their diet is made up of insects. Many species have well-developed songs.
Gnatcatchers are found in North, Central, and South America. They are very small birds with long, slender bills. Most species are a bluish-gray in color. They are found in open woodlands or scrubland. They eat insects. The blue-gray gnatcatcher is about 4-5 inches in length and is bluish-gray on its uppersides and white on its undersides. It has a long, white-edged tail and a white ring around its eyes. It is found throughout most of the United States. The black-tailed gnatcatcher is about 4 inches in length and is found in the deserts of the Southwestern United States. There is a subspecies of the California gnatcatcher (Polioptila californica), the Coastal California gnatcatcher (Polilptila californica californica) that is found in extreme southwestern coastal California. It is an endangered species. The black-capped gnatcatcher is found in southeastern Arizona. It is 4-5 inches in length and is bluish-gray with a black cap on its head.
 Endangered in N.H.
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 Threatened in N.H.
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 Introduced
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 Endangered in U.S.
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 Threatened in U.S.
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 Breeds in N.H.
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| New Hampshire Species |
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Other North American Species |
| Blue-gray Gnatcatcher |
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Arctic Warbler
Black-capped Gnatcatcher
Black-tailed Gnatcatcher
California Gnatcatcher
Cuban Gnatcatcher
Dusky Warbler
Japanese Bush-Warbler
Lanceolated Warbler
Lesser Whitethroat
Long-billed Gnatwren
Middendorff's Grasshopper-Warbler
Millerbird
Slate-throated Gnatcatcher
Tawny-faced Gnatwren
Tropical Gnatcatcher
White-lored Gnatcatcher
Willow Warbler
Wood Warbler
Yellow-browed Warbler
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