Did you want more wolves to spawn over time?
If that's the idea, the reason it doesn't work is that you insert the SAME wolf object over and over again. To get more wolves in, you need to create a new wolf before inserting it.
So instead of writing
addObject(wolf, ..., ...)
write
addObject(new theWolf(), ..., ...)
For the same reason, you will (currently) never get more than one snake.
2011/6/17