In Ark, the players need to help load animals and supplies into Noah's ark in preparation for the rains to come – but you can't just shove animals into stalls willy-nilly. If the meat eaters are boarded with plant eaters, you won't have those plant eaters around by the time the water recedes. Animals from cold and warm climates also need to be bunked separately so that they can all be comfortable. On top of all that, you have to worry about the weight of the animals; load too many on one side of the ark and you'll all be treading water for the next forty days and forty nights...