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into the niches presented by the various species of conifer. There are about 10 North American and 18 Eurasian types so far identified, with many known to affiliate with a particular conifer species or a suite of similar conifer species. While each type may be seen to feed on many different conifer species when not breeding, each has optimal breeding success only in a particular type of conifer forest. This isolates the populations against interbreeding,

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