Brian on Instagram: "The mouth of a white rhino is vastly different from a hippo mouth. Funny thing is, they eat pretty much the same, there are however differences in their digestive system, but that’s to big a subject to cover here, so let’s stick to the mouth. They are both big grazers with wide mouths, so why are they so different? Well self-defence is probably one of the main reasons. They have developed different defence strategies, rhinos have their big horns to use to attack or defend th