The Thick-billed Kingbird is a striking and relatively uncommon member of the flycatcher family found in Arizona, where it reaches the northern edge of its range. This large and robust kingbird is named for its unusually stout bill, which it uses to capture flying insects and occasionally small fruits. It is one of the more distinctive Tyrannusspecies in the region, with grayish upperparts, a pale yellow belly, a dark mask through the eye, and a heavy black bill that sets it apart from similar kingbirds.
In Arizona, Tyrannus crassirostris is considered a local summer breeder and is most often encountered in the southeastern part of the state, particularly in the riparian woodlands and desert river valleys of Cochise, Pima, and Santa Cruz counties. It favors tall cottonwoods (Populus fremontii), sycamores (Platanus wrightii), and mesquites (Prosopis spp.), often perching conspicuously on exposed branches while giving its sharp, ringing calls.
The species’ nesting activity in Arizona usually occurs from May through July, with pairs building bulky cup nests in tall trees near water. Because Tyrannus crassirostris is near the northern limit of its distribution—most of its range lies in Mexico and Central America—its populations in Arizona are limited and somewhat vulnerable to habitat changes, especially the loss of riparian corridors.
