Well, this is sad, and it happened in my own town.

Dallas Zoo officials said they can't explain how a 300-pound gorilla escaped from his enclosure, injuring four people before he was shot to death.

and...

Jabari was in the award-winning gorilla-conservation area, surrounded by a 16-foot concave wall, before the attack around 5 p.m. Some youths had reportedly teased Jabari shortly before.

"He had to have scaled the wall," said zoo director Rich Buickerood. But "this habitat is among the best in the country. This blows our minds."

Yeah...I've been to the Dallas Zoo and to this exhibit. It's a nice one, and it's hard to imagine how the gorilla got out.