Big birds are a group of large, flightless birds that can be found in various parts of the world. The term 'big birds' includes eagles (6 letters), emus (4 letters), rheas (5 letters), emeus (5 letters), and ostriches (9 letters). Eagles are large birds of prey found in many parts of the world, including North America, Europe, and Asia. Emus are large, flightless birds native to Australia. Rheas are large, flightless birds native to South America. Emeus are large, flightless birds native to Madagascar. Ostriches are the largest living bird species and are native to Africa.