Caves
bbc planet earth
*deer cave in borneo. Largest.
*glow worms capturing prey with silk and mucus.
*Use of colored lights to cheat cave illumination/ambiance
*manta rays in sea caves
*snake catching bats
*cave salamanders with external gills. Use of shadow on the wall.
*Bats getting snatched by birds of pray in mid air.
*Birds using echolocation clicks
*camera circling calcite stalacts
*mayans and cenotes
*sulfuric acid flowing out of via luz cave in mexico.
*la truquilla? bacteria using sulfuric acid. xtremophiles?