Mighty Eagle's cave

The Mighty Eagle Cave is a cave in the shape of the Mighty Eagle. It is shown in the short video Ham'o'ween and Surf and Turf levels.

The Angry Birds Movie
The Eagle's Den (Mighty's Cave On Bird Island) appears in The Angry Birds Movie. Mighty Eagle lives there and has trophies, paintings, and other memorablia of himself. It overlooks the Lake of Wisdom, which is used as a urinal by the Mighty Eagle. It was destroyed by one of Zeta's ice balls in  The Angry Birds Movie 2 (See here ).

Trivia

 * On the 3-Star Cable Car level on Ski Or Squeal from Angry Birds Seasons, a mountain is full of snow and the player has to defeat the Thief Pigs to reveal that it's Mighty Eagle's Den.
 * It also re-appears on the Eagle's Den level of Pig Days from Angry Birds Seasons.