keep them like sand monitors,they love to dig and burrow if allowed to,they grow about 4 foot in length,but dont think there not big,they are one of the stockyest aussie monitors,there short tailes to for a monitor which makes them shorter for there build compared to others,they need high basking temps at least 60 degrees at the basking spot,i repeat basking spot only at that temp,they still need cool areas as well,being in darwin u can keep them out doors id imagine,so cage size shouldnt be to much of a hinderance for u,have u kept any monitors before,id be more inclined to keep ridge tailed monitors first,but each to there own,lol,spencers are a great monitor,havnt had the chance to own one yet but definatly on my toget list,i keep lacies,,sandys,flavirufus and gouldi,mertons,ridgeys,gillens and storrs,so far,spencers and tristis will be next on the toget list as well as mangroves when funds allow,lol,hope that helps u