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Re:Feasibility of a Dune Ornithopter by vkou on Saturday October 23, 2021 @04:27AM (#28966666)
They are (deliberately?) juxtaposing calories (the scientific unit of energy) and kilo-calories (the nutritional unit of energy).

Unfortunately, the latter are, confusingly, also called called 'calories', despite one nutritional 'calorie' being 1000x of a 'regular' calorie.

Re:Feasibility of a Dune Ornithopter by FunnyLookinHat on Saturday October 23, 2021 @09:03AM (#28967993)
I thought it was accurate - k-cal are usually represented as Calories (capital C) as opposed to the individual unit of measure: calories.

See: https://en.wikipedia.org/wiki/Calorie

Re:Feasibility of a Dune Ornithopter by adrian_b on Saturday October 23, 2021 @06:23AM (#28967132)
Yes, that must be the source of confusion.

6000 to 12000 calories, not kilocalories, per day, means 1.5 g to 3 g per day of sugar, which is plausible for a humming bird.