|6218||FIGHTING||FIGHTING||1991||color||47 min||vhs|| (Trials of Life: A Natural History of Behavior series, Part 7)
Deciding whether to fight or flee depends on costs or advantages in any trial of strength. Zebras in the Serengeti assess their own fighting abilities in relation to those of their opponents. They then fight with an intensity in proportion to probable gain or loss. Weapons occur in all sorts of strange forms from the lion's lethal teeth and claws to the Malaysian stalk-eyed fly's eye stalks, to the cricket's noise-making back legs. Disputes, however, do not have to end in physical violence. Ritualized encounters between opponents are common in nature. Often resolution is achieved by signals, and the only damage done is psychological.