German Giants....you will always get a different opinion on anything about them. What is known and published is that they were imported from Germany many years ago [ hence the name] and are actually just a very large strain of Pogona vitticeps, I don't believe mixed with Barbata. Kevin Dunne had a female that reportedly laid over 60 eggs, and his website has a pic of this female. [ Dragon's Den heretoculture] They are large for the same reason that people are large. In other words, if Shaquille O'neill had children with a very tall woman, you would never expect to see their children be much smaller than they are. If all their children married equally large partners, the men in the 6'10 range, the women 6'2-6'5, it would continue to be a " family" trait. Once they started having children with shorter people, you would get a mix. This is a reasonable scenario, because there are dragons of all sizes today [ with several factors that contribute] but genetics is definitely one. Not everyone can really prove or disprove what is in a dragon's genetics for sure these days, and some people will continue to say they are this or that, including G,Giants.