A cactus in the rain forest! Not all cacti are found in deserts. This genus is adapted to live high up in the canopy in the nooks of the tree limbs. Although, still in a rain forest, life in the tree-tops without soil can involve long periods of drought. The bright red flowers suggest that these forest cacti are pollinated by hummingbirds. There are in fact tree cacti in the forests of South America that have normal looking leaves but spiny trunks and branches.