Chilling photographs show inside a disturbing experiment involving a litlte boy and his "sister" chimp who were spun on ...

It is almost 93 years since the experiment was abruptly terminated in the early part of 1932 - and below we take a closer ...

An experiment took place in the 1930s and involved a baby boy being raised alongside a chimpanzee for nine months - and it ...

This is the adorable moment a baby chimpanzee shared a playful interaction with a zoo visitor. The sweet moment between the ...