Gray-collared becard Pachyramphus major

Scarce bird of tropical forest and woodland, from lowlands to highlands. Usually seen as singles or pairs at middle to upper levels, especially at fruiting trees; often travels with mixed-species feeding flocks of tanagers, orioles, warblers, etc. Tends to perch rather upright and quietly, easily overlooked. Male striking: gray, black, and white; no similar species in Mexico. Female is smaller than female Rose-throated Becard, with short pale eyebrow, contrasting wing and tail patterns (note graduated tail feathers). West Mexican female has rusty cap; elsewhere cap is blackish.