Birds of prey, especially the more powerful ones, such as Bald
Eagles, Duck Hawks and Horned Owls.
3. Some species fight in competition for food. Conspicuous examples are:
The fiercer hawks;
Some carrion eaters, as the King Vulture, Black, Sharp-Shinned,
Cooper, Gos and Duck Hawks, which fight in the air over prey.
4. Certain birds show pugnacity in connection with the robber instinct, as:
Bald Eagle, which robs the Osprey;
Skua and Jaeger, which rob gulls.
5. Some species show general pugnacity. Species to be cited are:
Cassowaries, Emus and Ostriches, all of which are more or less dangerous;
Saras Cranes, which strike wickedly and without warning;