There are three types of grackles in North America. The Common Grackle is seen throughout the continent, the Boat-tailed Grackle is seen in the southeastern states and into the eastern areas of Texas. The Great-tailed Grackle is found along the southern borders of Texas and into Mexico.
The grackles have a wide range of colour including, browns, dark blues, dark greens to blacks. These colours depend on the maturity and sex of the birds, as well, whether it is in breeding or non-breeding plumage. The plumage is quite iridescent when they are in their breeding plumage.
Although somewhat different than ravens, crows and blackbirds, they are associated with the members of the blackbird group. These large birds are recognized by their long bills and long tails. They are not wary of people and are found visiting birdfeeders wherever they find them and inhabit most towns and cities. The grackles are not known for their songs but for having loud scratchy voices and squawking cries.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.