If you trying to bring ur parrot through end portal to the main world game crashes instantly. I have no idea how parrot pass throught portal in first time.
Whenever you came into loading distance of this parrot and end portal block crash repeats. 

Crashlog added. 

Upd. Finaly fixed it.  I loaded game as server and changed spawn-animals to false. Then i did it with spawn-animals true and replaced save. Sad stuff - i lost my save name. How its just "world".