smallest bear in the world that plays a key role in keeping these forests healthy. so when this week's cnn hero realized these bears were under threat he dedicated his life saving them. >> when i first started 20 dwreeryears ago, no one has ever studied sun bears. the more i learned about them, the more i care. the more i care, the more i worried. i have to help them. and this is why i want to be the voice for the sun bear to fight for the sun bear to ensure the survival of the sun bear. >> dedicating his life not just to protect the bears' lives but so many others that benefit from the rain forest. if you want to see more and find out how wong is helping them, go to cnnheros.com.