Depending on what you call intelligent, i think thats true. If you call IQ intellingence then youre on the right track. Nutrition accounts for a lot in the IQ development of any creature. There are exceptions for sure (not many though) but this is a general truth.
Originally Posted by Aberforth
" Now therefore kill every male among the little ones, and kill every woman who has known man by lying with him.
But all the girls, who have not known man by lying with him, keep alive for yourselves. "- Book Of Numbers 31:17-18