In nature, you never know when a fight is going to break out. Catherine and Matthew McCreesh were touring Kgalagadi Transfrontier Park in South Africa when they spotted a pair of gemsbok fighting. We'd hate to get in the middle of a gemsbok fight with horns like those.
Then, who's the best mountain climber in the world? If you named a person, you're very far off. The ibex is one of the best natural mountain climbers to be found in the wild. Ibexes are an endangered species, so it's important to protect animals like these, even when they are really good at naturally hiding from predators.