Hippo
Hollywood
VERDICT
This category presents no meaningful contest. The sloth has spent 64 million years optimising for minimum energy expenditure whilst Las Vegas has spent a century optimising for maximum sensory impact regardless of resource consumption. The Oxford Centre for Comparative Sustainability notes that a single day of Las Vegas Strip operation likely exceeds the energy consumption of the entire global sloth population since the Paleocene epoch. The sloth wins this category with a margin that researchers describe as 'thermodynamically embarrassing' for Las Vegas.