Evolution photos Evolution photos « 1 2 3 4 5 6 7 8 9 10 11 12 » Alder regrowth after flood (Alnus maritima in Oklahoma) A bird eating a parasite from a giant tortoise The guano ring The bulldozed prairie Colorado krummholz Rocky Mountain tundra Startling a predator Whitebark pine cone Evolutionary convergence of puncture vine and sandbur grass A bush that grows in Death Valley A tiny spring wildflower in the desert (Mimulus bigelovii) Slothful adaptation An oak gall Crab spider awaiting a meal Spider mommy « previous | next » Print Photos | View Full-Size Image Slothful adaptation Sloths eat toxic leaves that have little food value. Their adaptation for dealing with this is to simply not do very much. Photograph by Stanley A. Rice. Appears in Encyclopedia of Biodiversity.