Male red river hogs have small cone-shaped growths under their eyes. Females do not have these, which means they likely play a role in protecting males against injuries from other males tusks during fights.
Red river hogs spend a lot of time using their large snouts to dig for food (roots, tubers, seeds and insects). This is why it is so hard to get anything to grow in their habitat at Dublin Zoo.
Red river hogs communicate almost continuously with grunts and squeals.
The boar (male) will fiercely protect the sows (females) in his group from other boars and predators (especially leopards). Males may fight by butting their heads and snouts, whipping their tails and making loud noises.