Aussie sims.
I remember reading in New Scientist of a military aerial combat simulator for the military... trainees were rather taken aback when kangaroos stopped hopping and started firing surface-to-air missiles at them.
It turned out that the developers had felt an urge to decorate the landscape with some native fauna to aid realism, and done so by reusing some existing assets, ie code for enemy infantry. Unfortunately, whilst they had changed the graphics files of the troops to resemble hopping marsupials, they hadn't updated all behaviours.
( Penguin - another animal exclusive to the Southern hemisphere)