i was snoopin around the interwebs and came across this page. i can see its a little old but im going to comment either way. Zoe here says Lacertas need to be hibernated to breed and they should be housed only when they are breeding. Also Zoe says they can be quite aggressive to each other when they feed. I suppose these must be assumptions as i read Zoe has a Lacerta, not a pair of Lacertas. Also i looked at her pictures and she seems to have them in like a tropical wet setting. lacertas are from dry rocky sandy loamy areas...... I have had a breeding pair housed together for almost 3 years now. No hibernation (they are in my living room). I keep em at about 90 degrees, water the substrate about twice a week. I use a mixture of sand and peat moss and lots of flagstone. And the substrate is perhaps 4 inches at its deepest. The female just puts her eggs under a warm rock. And i have found that if i keep food available (cockroaches in a bowl) i can just leave the eggs in there and let em hatch. i have had three sets of babies hatch this way. got 7, 11, 9 out of the respective hatches. As for the aggression of the pair, the female runs the cage. And the male knows it, if she wants something he drops it and goes for something else. No problems. nuggetsbengals@yahoo.com if any questions.