The Achlis is one of a number of strange European beasts listed by the Roman writer Pliny the Elder (1st century BC).  He described it as looking something like an elk, but it had a number of curious features.  Its upper lip was so large that it had to graze backwards to avoid the lip Falling forward and covering it's mouth.  A further problem was caused by the fact that its Back Legs had no joints - it was thus forced to Sleep standing up, leaning against a tree.  This enabled wily hunters to catch it by partially cutting through the tree to which the Achlis came at Night.  When it leaned against the tree both fell to the ground, and the Achlis cold not regain its Feet quickly enough to prevent itself from being caught ny the hunters.