were they male rhinos?

from the new york times:

Since the early 1990’s, for example, young male elephants in Pilanesberg National Park and the Hluhluwe-Umfolozi Game Reserve in South Africa have been raping and killing rhinoceroses; this abnormal behavior, according to a 2001 study in the journal Pachyderm, has been reported in ‘‘a number of reserves’’ in the region. In July of last year, officials in Pilanesberg shot three young male elephants who were responsible for the killings of 63 rhinos, as well as attacks on people in safari vehicles.

source: an elephant crackup?