Razor wire has been added to a section of fence at Zoo Boise after a break-in left a monkey dead.
The wire was added this week, Boise Parks and Recreation spokeswoman Amy Stahl said.
"Were just trying to make a fence thats difficult to climb over even more difficult," Stahl said.
Stahl didn't know the length of the new wire.
Zoo officials have been reviewing security procedures since a burglary Nov. 17 in which 22-year-old Michael Jacob Watkins, of Weiser, is accused of killing a Pathas monkey.
Watkins remains in the Ada County Jail on $150,000 bond. Police say he told them he killed the monkey in self defense.
Director Steve Burns also is asking other zoos about their security procedures.