Baboon by David Jones
Fourteen year-old Gerry and his parents are returning to the African savannah after six months in London when their plane crash lands in the jungle, killing the pilot. When Gerry wakes, he has a terrifying shock. He is now a baboon. Using his human intellect and powers of reason, he ensures his survival and growing acceptance by a baboon troop. Just when things are getting comfortable, a shock attack by a leopard triggers Gerry's re-entry into his own body. In hospital, Doctor's tell him he has awoken from a coma - but does Gerry have the scars to prove otherwise?