..are mainly caused by the males attempting to determine the dominant male status in the pen, even if there are no females present. Almost every year, the first thing that happens when I put my semi-hibernating three toed turtles outdoors in the pen is they start a round of fights until the "alpha" male is determined and things settle down. It may be best to separate your males for a while, or else watch them closely, as one year my dominant male broke the jaw on one of my other males. He did this in just 15 minutes, too, as I usually keep the other turtle indoors in a terrarium. Box turtles are capable of doing serious injury to each other.