This video from the USA says about itself:
30 April 2017
Male and Female Great-Tailed Grackles making an amazing selection of “calls” in north Texas in April. Very similar to the Atlantic Boat-Tailed Grackles found in Florida except that the great tailed’s tail is bigger and sort of looks like a tail extension or second tail. The females are brown and about half the size of the males. Very social birds, It is interesting that the calls or “noises” made by these birds are significantly different from that of the Boat-Tailed Grackles, but no less melodious 🙂 The large male Great-Tailed Grackle at the top of the tree seemed to be the leader of this group.
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. It is sometimes erroneously referred to as a “blackbird” in the southern United States, although [American] blackbirds belong to the genus Euphagus [and European blackbirds to the genus Turdus]. Similarly, it is often called “cuervo” in areas of Mexico owing to its glossy black plumage, although it is not a member of the genus Corvus, nor even of the family Corvidae.