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These high-concern species breed in all major temperatezone habitats (see Appendix B), but nearly half are primarily associated with either grasslands or temperate eastern forests. Cerulean Warbler requires large tracts of mature deciduous forest for breeding, whereas Golden-winged Warbler requires disturbed or early successional forests in the same regions. Both of these warblers, along with boreal forest breeders such as Olive-sided Flycatcher and Canada Warbler, winter in tropical highland forests of Central and northern South America.
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