Boat-tailed Grackles are large, lanky songbirds with rounded crowns, long legs, and fairly long, pointed bills. Males have very long tails that make up almost half their body length and that they typically hold folded in a V-shape, like the keel of a boat.
The great-tailed grackle or Mexican grackle (Quiscalus mexicanus) is a medium-sized, highly social passerine bird native to North and South America. A member of the family Icteridae, it is one of ten extant species of grackle and is closely related to the boat-tailed grackle and the slender-billed grackle.
The slender-billed grackle (Quiscalus palustris) was a species of bird in the family Icteridae. The species was closely related to the western clade of the great-tailed grackle, from which it diverged quite recently, suspected to be around 2,000 years ago. The slender-billed grackle was endemic to central Mexico.