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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.

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.

I thought it was accurate - k-cal are usually represented as Calories (capital C) as opposed to the individual unit of measure: calories.

125k calories is about half a chocolate bar. It’s not a lot.

Only the "6,600 to 12,000 calories per day." is way off, because it's physics cal not nutritional (k)cal.

And it's more like 100lb of hamburger for a human, not 300lb.