My Mojave is about 3 months old now too. He has been extremely shy up till about 5 days ago, then he started crawling all over all the time. When I handled him he was alot less jumpy than ever before though, so I let him roam around a bit (first snake and gave him a month of quarenteen just the same. He kept the exploring behavior up the next day so I fed him a bit early.. and being a mojave of course he pounded that rat harder than I've seen him strike before.. and he's been calm the last 3 days now.

My theory? If yours is 3 months old it's probably just figured out you're not going to eat it, and is acclimated now. So it's time to explore and get the hell out of captivity! If you've had it long enough to make sure it's nice and healthy, you could let it out a bit under supervision... but beware the taste of freedom! I plan on having mine out alot in the evenings (once I get him not to save his poo for when he finds my clean laundry on the floor... grumble) to get excersize and stay healthy but I'm a hands on pet person. Over all I think the new activity is curiosity in mine at least.. not like he will ever stop eating to tell me he's not happy tho.