The iridescent purple head and golden eye are distinctive features of a grackle. This smart bird was supposed to be too big for this feeder, but it figured out a way to get some food! It used its size to its advantage by reaching its head around to grab a tasty treat!
Here is another view:
*posted for JNW’s color your world challenge: royal purple
I love those mystery (is it purple or is it blue?) colors!