PEORIA, Ariz. — A suburban Phoenix elementary school received some wild visitors.

Staff members saw four burros walking onto the playground of the school in Peoria on Sept. 15.

Peoria Unified School District spokesman Erin Dunsey said employees saw the burros enter the grounds through a parking lot. The animals then went to the playground and left through a side gate.

Dunsey said the burros were there only briefly and before any students had arrived. Peoria police spokesman Brandon Sheffert said authorities received a call about burros running on a golf course and believes they were the same animals.

Officials with the U.S. Bureau of Land Management said it’s unusual to see the animals in a residential area.