I was talking to my brother, who's playing the Day Z alpha for the stand-alone game (NOT the mod), and we discussed how to improve the game (as it obviously has kinks and bugs), and then the subject of adding bears came up.
The basic idea is that they should be relatively rare, and only show up in the woods, isolated villages and military bases (they need food too). They'd be very damage resistant and would require properly thought out strategy or exceptional weaponry to reliably take down. So kinda like a mini-boss of sorts.
You could add other wildlife, like pumas, who're just fast and relatively strong enemies, and wolves, who're fast, but not overly strong, just more the threat of numbers.
Making a poll out of curiosity for feedback to the devs.