WEST PALM BEACH, Fla. — Two bush dogs have been presumed dead after flooding at a Florida zoo.

A Palm Beach Zoo news release says the habitat was discovered flooded Monday morning during routine checks of the small, South American canines. Workers spent the rest of the day pumping out water and excavating the area, but the animals weren’t found.

Zoo director Jan Steele says bush dogs like to burrow, so they probably dug deeper into the ground as the habitat filled with water.

The zoo has contacted the Florida Fish and Wildlife Conservation Commission, and an investigation is ongoing.