I love great-tailed grackles! I first became aware of them when I was at a campground in Texas along the coast. I pulled into my spot and there were there to greet me. It was mating season, and I thought they were so funny because the males were doing everything they could think of to get the attention of the lady birds, who are a soft brown and smaller, by the way. They were chirping, whistling, and tweeting like canaries, plus they were dancing around with their wings lifted and bowing their heads. I think they would have done cartwheels, had they been able. And the ladies? Mostly ignored all their antics! Here is a video I found online dancing to attract a very hard-to-get lady:
https://www.youtube.com/watch?v=fj1cqIXJz6EA lot of people in the south hate these birds and consider them pests. You will find them often in parking lots and places where people are congregated. An old friend came to visit me while I was in Las Vegas a couple of years ago, and all she had to do was say, "What ARE those birds in parking lots?" and I knew exactly what she was talking about!
There is a very closely related similar bird in Florida and slightly up the eastern coast called a boat-tailed grackle. They are also tall and lanky, but have different eyes and a more rounded tail. They also make a lot of sounds, but I think the great-tailed versions are funnier and more vocal. Both are very different from our northern grackles that just squawk.