Nigel

 Nigel the Cockatoo, known simply as Nigel, is the main antagonist in Rio, Rio 2 and Angry Birds Rio. He is an evil Sulfur-Crested Cockatoo. He kidnaps the Angry Birds along with other rare species. He is battled in the last level of Jungle Escape as the first boss character in the entire Angry Birds series. Nigel appears as the Angry Birds' first enemy that moves on its own. He has appeared in theme 4-15 and theme 12-15. Nigel is stronger in level 12-15 than in level 4-15. You get 10,000 points if you defeat him. Nigel also appears trapped in a cage in level 20 of High Dive. He will laugh at the birds when freed and cannot be defeated. This is his only appearance where he must not be fought.