The mom runs a day care! She had been told by her son that he wanted to climb in there, but got distracted by a daughter who didn't want to go home.

If the zoo's barrier is up to standards, and a four-year-old was able to climb in, the standards need to be changed.

It wasn't until zoogoers started screaming that to gorilla was attracted to the moat, at the other end of his large compound, and he went to investigate. The screamers agitated him and his behavior became erratic. It was many minutes before he dragged the boy into the moat.