Black-capped (Poecile atricapillus) and Carolina chickadees (P. carolinensis) hybridize in a narrow band that stretches from New Jersey to Kansas. Using a combination of genomic, transcriptomic, and ...

Although the mountain chickadee is the black-capped’s closest relative, the Carolina chickadee likely will cause the most trouble, especially in late spring and summer when the black-capped’s ...