[mapkkk]

I’m on mobile so I can’t provide you with a good quality reply with sources, but we are taught in medical school that alcohol calories are not metabolized the same way as other nutrition.

In a very back of the envelope kind of way, here’s why: Alcohol is metabolized not as nutrition but as poison, and while yes, ethanol is very calorific, the calories derived from are lost (mostly) as heat. And, because of the metabolic pathways utilized, other important substances required by cells are depleted (products of the Pentose Phosphate Pathway - PPP) in the quest to detoxify alcohol. Running the PPP is generally an energy intense process, so you’re at a net loss when al said and done. This can partly help explain why chronic alcoholics are not overweight. This is excluding the calorie debt owed to repairing cell damage from the cytotoxic effects of alcohol.

If anyone’s interested, I can recommend some Biochemistry textbooks for a deep dive.

EDIT: Forgot to mention, partly thanks to the metabolic reasons, alcohol results in hypoglycemia, so it is unlikely that the bird would experience feelings of satiety after imbibing.