In competition for food a bat can jam another's sonar:-"Bats use echolocation, or biological sonar, to find and track insect prey in complete darkness. When a bat hears a competitor going in for the kill, it makes a specialized jamming call to prevent its competitor from making the catch. The bats often take turns jamming each other until one of them gives up."-http://www.sciencedaily.com/releases/2014/11/141106143721.htm