OEMs are not actually the original manufacturer of the equipment, but are actually a company who has a relationship with the original manufacture to resell that manufacturer's product under its own name and branding.
Definition of warthog. : a wild African hog (Phacochoerus aethiopicus) that has large protruding tusks and in the male two pairs of rough warty excrescences on the face and that is sometimes placed in two separate species (P. aethiopicus and P. africanus)
As the young run in single file, the tail position may serve as a signal to keep them all together. Warthogs trot with a springy gait but they are known to run surprisingly fast. The warthog has poor vision (though better than most other African wild pigs), but its senses of smell and hearing are good.