DODGE CITY, Kan. (AP) — A capuchin monkey at a western Kansas zoo is recovering after it was injured while apparently trying to stop an intruder from taking a younger monkey.

Officials at the Wright Park Zoo in Dodge City say the older monkey, named Vern, was hurt and his son, Pickett, was found on the outskirts of Dodge City Sept. 3. The younger monkey was not injured.

Officials initially thought Vern’s injuries were minor but a veterinarian found injuries apparently caused by blunt force trauma. The monkey underwent surgery at Kansas State University Sept. 10 to repair broken bones.

Zoo spokeswoman Abbey Martin said Monday Pickett is doing well and is back on display. Vern remains in quarantine while he recovers.

Dodge City police are investigating the incident. Martin says there are no developments in the investigation.