Grackles are identified as Common and or Boat-tailed Grackles, the latter being more common than the other. The Boat-tailed Grackle is a much larger bird with a proportionately larger and wider tail(resembling the keel of a boat.) Both birds however show a blue iridescent sheen when the light strikes them from the right angle, otherwise they may appear solid black and usually mistaken for Crows. They are spotted almost everywhere in North America. They abound in my backyard and devour most of the seeds from my feeder.
What also differentiate these birds is their eyes color. The common Grackle has striking yellow eyes as well as the Boat-tailed from Northern States, but Florida’s resident Boat-tailed Grackles do not.
The male-female differences in the Boat[tailed Grackle are very striking like in most birds. The female grackle is brown in color and doesn’t even look like the same species.