Yes they do, normal feeding for mine. There are genetics and human nature at play. The sub Saharan royals tend to be bigger with very large heads. Mine is one. Her offspring also tend to be large too.
Big females often lay more and larger eggs. This means a breeder is likely to keep and regularly breed a large female. Size tends to be a trait that is passed along. The end result is larger animals.
The last factor is the tech and understanding of royals in captivity is increasing. Years ago there were misunderstanding and imperfect housing. Now housing is improved and understanding so longer lived healthier animal are resulting. This is allowing them to grow to the full potential. Again bigger animals.
There is still lots of learning! There still is no exact idea of upper age limits. We know 47 years in captivity but that animal was an adult when brought in from the wild.
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