The problem with knowing any amount of history is that any time anything happens you’re just like:

‘Oh. This again’.

It’s somehow both tedious and horrifying.

When your hobby becomes your job!

Parents would find their baby child had been replaced by odd beings who were almost but not quite human.

However strange appearances aside it was their behaviour that marked them out - changelings were said to be either extremely badly behaved - constantly crying and prone to violence, or at the other end of the spectrum strangely docile, often mute and seemingly unable to comprehend anything about the human world they had been left in.

https://www.hypnogoria.com/folklore_changelings.html

Yep, totally a brand new thing that hasn’t appeared throughout human history.

“The mudbloods are stealing our magic!”

That’s Fergus Wilson - frankly, I’d prefer the leech.

You joke, but crop milk is a thing:

Crop milk is a secretion from the lining of the crop of parent birds in some species that is regurgitated to young birds. It is found among all pigeons and doves where it is also referred to as pigeon milk. Crop milk is also secreted from the crop of flamingos and the male emperor penguin, suggesting independent evolution of this trait. Unlike in mammals where only females produce milk, crop milk is produced by both males and females in pigeons and flamingos; and in penguins, only by the male. Lactation in birds is controlled by prolactin, which is the same hormone that causes lactation in mammals.

I bet he drinks Carling Black Label.

(https://piped.video/watch?v=aY9GBl7UmVs)