The Gray Kingbird (Tyrannus dominicensis) is a large passerine bird found in the tropical and subtropical regions of the Americas. They have a length of 9-10 inches and weigh around 1.5-2.5 ounces. These birds have a long, broad bill and a relatively long tail, which makes them easily identifiable.

One of the distinguishing field marks of the Gray Kingbird is its overall gray plumage, which is slightly darker on the wings and tail. They have a distinctive white band on the tip of their tail, which is visible when they fly. They also have a bright red patch on their crown, which is visible when they are excited or agitated.

Gray Kingbirds are migratory birds, and their range extends from the southern United States to northern South America. During the breeding season, they can be found in open woodlands, savannas, and forest edges, where they build their nests in tall trees. During the non-breeding season, they are found in a variety of habitats, including mangroves, coastal scrub, and urban areas.

These birds are known for their aggressive behavior towards potential threats, including other birds and humans. They will often perch in prominent locations, such as tree tops or power lines, and swoop down to chase away perceived threats. Gray Kingbirds feed primarily on insects, which they catch in mid-air. They also eat small fruits and berries.

In conclusion, the Gray Kingbird is a striking bird with its overall gray plumage, bright red patch on its crown, and distinctive white band on its tail. They are migratory birds found in a variety of habitats across the Americas, and are known for their aggressive behavior and insect-eating habits.