Never had a burm but i can definitely tell you retics grow fast lol. Caesar went from 2' long at 5 months old to now 7' at 1.3 years old. Just note that retics or at least Caesar is not a cuddly little lounger like the boas. He is a gogogo machine that is as nice as the boas but just doesnt really like to sit still unless in his cage. In his cage, he is laid back and i can reach in, pet him, push him around to clean poops and other stuff and he just goes with the flow. Feeding time though, he is crazier than the boas and the boas are pretty freakin scary at dinner time. I almost got tagged by Gina last night during feeding time. She smelled mice on my hand and shot at me twice lol. And Louie is like Caesar at dinner time. When he smelled his mouse, he shot straight in the air and grabbed the tong but wrapped the mouse lol. He let go of the tong and just stared at me while he held his mouse. He let go of the mouse and I reached in slowly with the tongs and picked up his mouse. He spun around, saw me taking his mouse and flew at it with mouth open and grabbed it haha. He's crazy when it comes to food.