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Luella and Winthrop Niles Kellogg believed they could use their own child in a chilling experiment involving a chimpanzee.
Toddler Donald Kellogg was just 10 months old when he became one of the subjects in the horrifying and doomed research.
The youngster was left in floods of tears when he was subjected to hideous trials at the hands of his parents Luella and Winthrop Niles.
The scientist couple believed if they raised the chimpanzee alongside their own child, the animal would become more human - it had disastrous consequences.
The Kelloggs moved Gua the chimp into their home on June 26, 1931, reports the Mirror US .
The horrifying experiment had to be abandoned nine months later when it was Donald who "became more ape than human".
His parents obser