I have a picture of 3 of my beardies together all exactly the same size within millimeters. Now 4 months later, I have 3 completely different sized beardies. THe smallest of the 3 is now the largest female, 18" and 380 gms, the male is 16" and 280gms, slim build, and the oldest female is 15" very chunky, 240 gms. They all had different eating, and sleeping habits. I can tell you one thing, the biggest one was a skinny rescue and is a non stop eater so I'm sure their appetite has something to do with it. All are housed under mvbs as well.