Many years ago, I used to buy from Gan's Farm the huge jumbo cardinals which he told me were from certain parts of the Amazon. He shared that cardinals from different areas of the Amazon basin can grow to different sizes. If yours are not with the jumbo gene, it will never grow to those jumbo size.
I have not been to Gan's for a number of years already so I do not know whether he is still importing in those jumbo cardinals. At that time, he also kept those huge Holland Rams too.
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