iguana can live 20+ years. living in tropical areas they need alot of humidity around 80%. a male green iguana can be has heavy has 15 ponds. talking about MBD would be good also when your friend does his report cause alot of iguana owners dont give them the proper lighting. a diet for these green giants should be the following: 70% leafy greens, 15-20% veggies, 5-10% fruits and 5% or less in bread, rice, pasta, ect. also has a rare rare rare treat like on there birthday or christmas or something you can feed them yogurt even though they love the stuff it is animals protein and realy shouldnt be fed to them. cageing for a full adult male can be as small as 7 feet high 5 feet long and 5 feet deep all the way to a small spair bed room. with a female iguana they will become gravid every breeding season even with out a male so youll have to set them up a place for them to lay there eggs. they will aslo absorb them back into there body but relying on these is risky and can result in a death if all the eggs are not absorb. male iguanas will change colors in the breeding season from there normal green to a bright orange to show off to the females. males will become aggresive dureing this 2-3 month period. some VERY aggresive some you can hardly tell its breeding season but most will become fairly aggresive. on the cool side of the cage i keep mine at 85 and the hot side at 95. hmmm i think that should do it for you! hope this helps you!