A four-year-old boy fell into a gorilla habitat at the Cincinnati Zoo on Saturday, and the gorilla had to beshot and killed.  In some of the YouTube videos you can hear the mother calling out to her boy and trying to reassure him.  (The boy was in there with the gorilla for about ten minutes.  At some points it looked like the gorilla was trying to protect him.  But they had to shoot it because it was dragging the boy around by the leg, in about a foot of water.