\" \" Are you team bat or team dolphin? Before you declare yourself for \"Team Bat\" or \"Team Dolphin,\" here's a breakdown of the matchup. Another option is to fight dirty: The Mexican free-tailed bat deliberately releases sounds that jam other bats' sonar signals. On the other hand, the sonar clicks used by toothed whales tend to be a lot more homogeneous. Instead of getting disoriented, the aquatic beasts slightly altered the timing and frequencies of their outgoing sonar signals.