Research on the Duisburg fossas has provided much data about their biology. During mating, a "copulatory tie" occurs in mammals such as fossas, canids and Japanese martens. A long, high yelp may function to attract other fossas. The supraspinatous fossas are divided by a "secondary spine" and the bronchi are divided anteriorly. Fossas are occasionally held in captivity in zoos. Fossas communicate using sounds, scents, and visual signals.