Warning at night it's almost impossible to kill and I've seen a level one get up during the night and kill my level 45 rex

If you want to take it your best bet is to find one in the caves and you should block of the other passages because ones you agro one you agro them all. Get a bow and shoot it full of trank arrows but make sure you start at the begining of the day because they wake up at the transition from day to night. and it's easiest to give it kibble after letting it starve but make sure you check the time of day before you do .Good luck

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