Three males I was observing were using oil (gas)drilling platform grounds for their leks. One male was so aggressive that any other males who tried to enter the lek were usually lasting a few seconds as the dominant male was ready to attack at the first sign of another male getting close to the lek border.

The oil company trucks were entering the platform ground from time to time. The male who was holding the ground immediately attacked the vehicle. Thanks to the careful drivers, no accident occurred. At least I am not aware about one. When people were stepping out of parked vehicles this male was attacking them as well. In some cases grabbing the pant material with his beak and holding on to it. Sometimes hanging above the ground in the air while holding the grasp.