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Description
Cool facts from www. birds. cornell. edu

Where the two species ranges come in contact, the Carolina and Black-capped chickadees occasionally hybridize. Hybrids can sing the songs of either species, or might sing something intermediate.
In winter, Carolina Chickadees live in flocks of two to eight birds and defend areas against other flocks. Dominant birds in these flocks establish breeding territories in the summer that were part of the winter flock's range.
The pair bond between a male and female Carolina Chickadee can remain intact for several years. The probability that a pair will remain together seems to vary among populations, with nearly all pairs remaining together in subsequent years in a study in Texas, but only half staying together in a study in Tennessee. If a nest attempt fails, a female may seek out a new male on a different territory.

Description
Cool facts from www. birds. cornell. edu

Where the two species ranges come in contact, the Carolina and Black-capped chickadees occasionally hybridize. Hybrids can sing the songs of either species, or might sing something intermediate.
In winter, Carolina Chickadees live in flocks of two to eight birds and defend areas against other flocks. Dominant birds in these flocks establish breeding territories in the summer that were part of the winter flock's range.
The pair bond between a male and female Carolina Chickadee can remain intact for several years. The probability that a pair will remain together seems to vary among populations, with nearly all pairs remaining together in subsequent years in a study in Texas, but only half staying together in a study in Tennessee. If a nest attempt fails, a female may seek out a new male on a different territory.