Corrected entry: If the lizards are born pregnant and produce offspring within 12 months then the "mother" lizard would have already produced many litters prior to the one in New York and those offspring would have in turn produced their own litters meaning the planet would have already been over-run long before the litter of 200 in New York. That is, unless the "mother" lizard in the movie is only 12 months old herself and the New York litter was her first (which in itself would be ridiculous). Not to mention that the "mother" would also have 199 brothers and sisters all producing offspring.
LorgSkyegon
6th Apr 2013
Correction: Why is it so ridiculous that the litter would be her first? Zilla may only be 12 months old. Or she may have laid eggs 12 months after reaching maturity. As for the mother having brothers and sisters, watch the beginning of the film. You can see there is only one egg left on the bombed atoll.
LorgSkyegon