MacGillivray's Warbler is a small songbird belonging to the family Parulidae. It is primarily found in the western regions of North America, particularly in dense shrubs and riparian habitats. This bird is known for its olive-green back, yellow underparts, and distinctive gray head, making it easily recognizable. The species is migratory, spending winters in Central America and returning to its breeding grounds in the spring. MacGillivray's Warbler feeds on insects and other invertebrates, often foraging near the ground. Its melodious song is a key feature during the breeding season, helping to establish territory and attract mates.