You change 'forum ranks' depending on your number of posts!
'Adult hamster' requires 250 forum posts, which you have passed
Here is the link for more information: Forum Ranks
Ohhh I thought it was something to do with the date of birth u have filled in !! Do u fill in our date of birth anyway ? Can't remember !!
Yes you fill it in when you register. You cannot change it though but you can update the privacy of it in the User CP (so it will not show the year for example) x