Rhinos are not so much pugnacious as We are roughhousers. We enjoy pushing and being pushed. Substantiation.
Roughhousing is a skill like playing the ukelele or digesting radial tires or snowboarding. Capacity requires shaping into accomplishment.
Rhinos practice so We can Roughhouse without Consequences. One way adolescent Rhinos improve is by bashing into trees. In the Wild, the trees are strapping. And yes, so are We.