Panda
The giant panda presents one of nature's most spectacularly inefficient energy systems. Having evolved as a carnivore before inexplicably committing to a bamboo-exclusive diet, the panda must consume between 12 to 38 kilograms of bamboo daily—spending up to 14 hours feeding—simply to extract enough nutrients to maintain basic biological functions. Their digestive system, stubbornly carnivorous in design, processes merely 17% of ingested bamboo, resulting in the production of approximately 28 kilograms of faeces per day. It is, by any objective measure, a metabolic catastrophe wrapped in fur.
Bicycle
The bicycle stands as humanity's most energy-efficient form of transportation. A cyclist travelling at 16 kilometres per hour expends roughly 0.15 calories per gram per kilometre—more efficient than walking, driving, or even the flight of birds. The mechanical efficiency of a well-maintained bicycle chain approaches 98.6%, transmitting nearly all pedalling force directly to forward motion. No fuel is wasted on digestion, no energy lost to fur maintenance. The bicycle converts human effort into distance with almost mathematical purity.