With the recent Israeli and American attack on Iran the price of oil has shot up and shows no signs of going back down. This seems like a good time to remind people that a bicycle is the most efficient form of human-powered transportation. Indeed, the graph above is an update to a popular graph showing efficient transportation, but grouped into the animal kingdoms. Save gas, save money, and get fit by riding a bike this summer.

Travel involves two main expenditures of energy: fighting gravity and propelling yourself forward. Most terrestrial animals must expend energy first to stand up, then to take each step forward. (Longer-legged land creatures tend to be more efficient because they get more distance out of each step, which explains why mice are so inefficient.) Flying animals, though, can move forward cheaply by gliding through the air, carried more by currents than by their own power. Swimming animals can similarly glide through water while letting their natural buoyancy minimize the need to fight gravity.

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