The Mariana crow is a species of the crow family from the tropical Western Pacific. It is a glossy black bird about 15 inches (38 cm) long and known only from the islands of Guam and Rota.
Region
Micronesia, Mariana Islands
Typical Environment
Historically on Guam and Rota, it now survives primarily in native limestone and secondary forests on Rota. It uses coastal strand, forest edges, and interior canopy but avoids heavily urbanized areas. Nesting typically occurs high in large native trees in relatively undisturbed forest tracts. The species requires intact forest structure for feeding and nesting and is sensitive to invasive predators.
Altitude Range
Sea level to 500 m
Climate Zone
Tropical
Ease of Keeping
Beginner friendly: 1/5
The Mariana crow is a glossy black corvid endemic to Guam and Rota, renowned for its intelligence and problem-solving ability. It has been extirpated from Guam, largely due to predation by the invasive brown tree snake, and now persists mainly on Rota. Conservation efforts focus on nest protection, predator control, and population monitoring. As a forest specialist, it serves as an important seed disperser in native limestone forests.
Temperament
wary, intelligent, and territorial
Flight Pattern
strong direct flight with steady wingbeats; short bursts between trees
Social Behavior
Typically found in pairs or small family groups that defend year-round territories. Pairs build nests high in canopy trees and lay small clutches, investing heavily in chick care. Juveniles may remain near parents for extended periods while learning foraging skills.
Migratory Pattern
Resident
Song Description
Vocalizations include harsh caws, croaks, and rattling calls used for contact and alarm. Softer, more subdued notes are given near the nest or when interacting at close range.
