SAN DIEGO — A gorilla at the San Diego Zoo broke a glass panel at his enclosure over the weekend, zoo officials said this week, frightening guests who were observing the apes. Ten-year-old Denny broke one of three layers of protective glass at the zoo's Lost Forest gorilla habitat Saturday, the zoo said in an updated statement Tuesday. "It is common for male gorillas, especially in adolescence, to express these types of behaviors," it said. "Bursts of energy, charging, draggin

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