According to the writer, the birds…………

The pigeon-sized “cock of the rock” is a member of a tropical family of birds found in remote, sparsely-populated areas of South America. In season, a number of the male birds gather together in a dense group to claim and defend individual territories used solely for mating. They lock their powerful claws together and hit each other with their wings. If there is not a clear winner, the birds rest and then fight again until superiority has been established. Fights are not uncommon because the mating territories are relatively scarce compared to the size of the bird population.