The locomotor patterns of red colobus monkeys (Colobus badius) were sc
ored under three different conditions: normal daily activities, in sig
ht of a terrestrial predator, and after the playback of a crowned hawk
-eagle call. Relative to the normal movement activities, the terrestri
al and avian predator experiments showed fleeing movements to be very
rapid with an increase in the frequency of leaping and vertical boundi
ng. Movement distances also increased in response to the avian playbac
k experiments. Although rare, it is possible that rapid movements may
better reflect anatomical design than movements during normal daily ac
tivities.