The Harpy Eagle is the world's largest and strongest eagle. It's also one of the rarest.

Few other animals depend so heavily on pristine, unpolluted habitat as the harpy eagle. This magnificent bird  mates for life. Each pair needs at least 15 square miles of rainforest to hunt in with their relatively short but very broad 7-8 foot wingspan and talons that would make a grizzly bear envious. They nest in tall thick trees that burst out of the thick rainforest canopy. Unfortunately this is the kind of tree that loggers value. This is one of the reasons that this amazing bird is now so uncommon.  

They range from Panama to southern Brazil and are vary rare across most of this.  They nest once every two years and raise one chick, which they feed a very similar diet which they themselves eat.  This includes monkeys, sloths, porcupine, large birds and young deer.