The Harpy Eagle is a Neotropical species of eagle. It is the largest raptor found in the Americas, and among the largest extant species of eagles in the world- it looks like Buckbeak from Harry Potter!
The hearth and the Salamander can also mean happiness and if Montag chose to be happy or not. The two things in his life his home and his work. Did it really make him happy. He chose happiness over this home and his work by reading the books.