In her later work, she studied the vocalizations of voles, in "Ultrasonic vocalization and body temperature maintenance in infant voles of three species (Rodentia: "Arvicolidae")" ("Developmental Psychobiology" 1992), and "Ultrasonic calling in isolated infant prairie voles ("Microtus ochrogaster") and montane voles ("M. Montanus")" ("Journal of Mammalogy" 2002).