The most famous name in the animal kingdom this week is Harambe. The 17-year-old gorilla was killed at the Cincinnati Zoo last Saturday after a little boy fell into his habitat. Harambe didn't harm the child but zoo officials decided to put him down after about 10 minutes. They say the gorilla may have ultimately decided to hurt the boy. Those who worked closely with gorillas at the zoo admit there was no way to predict the animal's behavior. Emory University primatologist Frans De Waal explains how we can determine animals' intellect.