Also, not all grackles look the same. A lot of the times it can have something to do with what position the sun is hitting their feathers. For example, this picture: https://www.google.com/search?q=grackle&client=safari&hl=en-us&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjtvbyO8Zr3AhXYkIkEHW4HA14Q_AUoAXoECAIQAw&biw=1121&bih=728&dpr=2#imgrc=GiM0B6s4PHW4aM