I've had Luca and Felix for 6 months now, and they've grown so much! It's been interesting to watch their changes over time. At first Luca weighed more than Felix, but now Felix weighs more than Luca. They're still equal to one-another in length though. I've also noticed recently how much their eyes have been growing. Felix even has slightly uneven eyes right now because he's in a growth spurt. It's normal for telescope eyes to sometimes grow unequally as they mature and develop, but they usually even out again. Looking forward to another good 6 months!