It's unclear whether three men caught trespassing at the zoo are connected to the stealing of a monkey about 10 days ago.
The zoo's not the place to browse for pets, but who knows what three men were up to when they jumped a back gate and trespassed on San Francisco Zoo property over the weekend.
Some might say they were probably up to some monkey business.
The San Francisco Examiner reports security guards nabbed the men Sunday night - after they were caught in a secure area of the zoo. The paper said the guards spotted the men at around 11:40 p.m.
Only one of the them had identification on him. He was cited by police. The two others did not, and were in turn booked by officers.
It's not clear if this latest break-in is connected.