Cheetahs and hummingbirds both have remarkable abilities, but how do they sustain their exertions? Cheetahs can sprint at their fastest for about 30 seconds, while hummingbirds have to consume nearly their full body weight in nectar each day to survive. Some hummingbird species have evolved bigger feet and shorter beaks to allow them to cling to perches and sip nectar without expending as much energy. The evolution of these animals' abilities and physical characteristics remains a mystery.