Described for use as a key ingredient in an animal control composition and more particularly in an animal repellent composition, is the genus of steroids defined according to the structure: ##STR1## wherein X completes a substituted cyclopentyl moiety and is one of the moieties: ##STR2## wherein Y represents...http://www.google.es/patents/US4534976?utm_source=gb-gplus-sharePatente US4534976 - Method and means for repelling animals
