Jane Goodall, the world's foremost expert on chimpanzees, writes:

"Often I am asked if the chimpanzees show any signs of
religious behavior. I think perhaps their “elemental” displays
are precursors of religious ritual. Deep in the forest
are some spectacular waterfalls. Sometimes as a chimpanzee
– most often an adult male – approaches one of these
falls his hair bristles slightly, a sign of heightened arousal.
As he gets closer, and the roar of falling water gets louder,
his pace quickens, his hair becomes fully erect, and upon
reaching the stream he may perform a magnificent display
close to the foot of the falls. Standing upright, he sways
rhythmically from foot to foot, stamping in the shallow,
rushing water, picking up and hurling great rocks. Sometimes
he climbs up the slender vines that hang down from
the trees high above and swings out into the spray of the
falling water. This “waterfall dance” may last for ten or
fifteen minutes."

Read more on apes' culture in her article, "Primate Spirituality":
http://www.religionandnature.com/ern/sample/goodall--primatespirituality.pdf