All Life use about as much energy at rest as a MacBook drawing power from its battery

NVDL: In this sense, living organisms are quite efficient. Even the most efficient machine (excluding a bicycle) are far less efficient at energy deployment than a living organism. This is because life has had billions of year's to evolve - machines have had 100 years in most cases, or less.

clipped from blog.wired.com If energy is the currency of life, biologists are closing in on the cost of living. No matter whether you're talking elephants or bacteria, a new study proposes that, pound for pound, all living things' at-rest metabolisms use similar amounts of energy. Though living things vary greatly in complexity and size, their energy usage falls between 3 and 90 watts per kilogram of biomass. For comparison, a MacBook Pro is supposed to draw about 12 watts when operating from its battery.