Memorial Day weekend marks the kickoff and 84th anniversary of Carlsbad Caverns' summer bat watching program.
Park rangers have presented summertime bat flight programs since 1929, making Carlsbad Caverns National Park one of the best-known bat colonies in the world.
During the nightly programs, rangers dispel myths and extol the virtues of bats as the nocturnal creatures spiral out of the cavern on their nightly forage for insects.
The nightly number of bats fluctuates depending on weather and temperature.
Copyright 2013 The Associated Press.