Medium-sized hummingbird, iridescent bronzy green top side; grayish below, with dark tails. Adult males (and some young males) have both a rose gorget and crown, unlike any other North American hummingbird. Adult females may have few rose gorget feathers, but usually lack color on the crown.
For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.
Nests often found in oak trees, along with vine, brush and human-built structures. Nests built in February and only used once. Materials reused in completion of second nest.
Diet consists of nector and small insects. Also spiders and tree sap.
Average clutch size two eggs. Eggs usually laid before completion of nest; construction continues. Incubation lasts 14 to 19 days.