Half Brother by Kenneth Oppel
Summary: When his mother comes home with a baby chimpanzee for his father’s university experiment, Ben has his doubts. Hoping to determine if chimpanzees are able to be taught language through using American Sign Language, Zan moves in with them and everyone except Ben’s father find themselves growing attached to him. The problem is while Zan is being raised like a human, he is still a chimp, and after they lose an opportunity for a major grant the whole project is in jeopardy. Ben and his mother struggle to keep Zan with them no matter what, but since he is owned by the...
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