Chickasaw National Recreation Area rangers are investigating the death of a young bull bison found Thursday evening.

CNRA spokesperson Ron Parker said the animal was found in bison pasture paddock.

“The cause of death is undetermined and under investigation,” Parker said adding a recent veterinary check of the herd indicated the “health of the herd is good.”

The park acquired the first buffalo in February 1920. Three animals were brought by citizens to then Platt National Park in horse-drawn wagons from Oklahoma’s Wichita Mountains Wildlife Preserve. With the help of local businessmen, an area behind Pavilion Springs was fenced for the animals. The herd was later moved to the present pasture paddock in 1934. A new corral at the paddock is being constructed to assist in management of the herd.