Lots of formation signs originate with apparently un-military sources. The Jerboa, AKA the Desert Rat isn't particularly fierce or heraldic The Bull used by the 11th and 79th Armoured Divisions are heraldic, but as the emblem of the Hobart family.
An elephant's backside. 253 L.O.C. Sub Area, IVth Corps. It makes sense when you see IVth Corps' Formation Sign.
