The caretakers found the blue-eyed, stub-tailed pair of young bobcats on Saturday and, thinking they were Bengal kittens, took them in.
They fed the bobcats milk from pet-feeding bottles but realized something was amiss when the aggressive animals tore the bottles apart and bit them.
They called animal control officers and a wildlife rescue group took the wild cats away.
Workers intended to wait in the alley hoping to find the mother and reunite her with the cubs.