Years ago in Australia, I took my four-year old neice to the Royal Adelaide Show. We watched a display of sheep-shearing & the little girl was quite fascinated.
When the first sheep was released minus its fleece, she loudly announced "So that's how they make pigs!"
We'd left my daughter who was about 2 at the time, watching an programme about cows and pigs giving birth (it was a children's programme) and were talking to neighbours outside. She came running out and shouted 'mummy were you a cow or a pig?'
Many moons ago, my cousin was taken on a bus journey into deepest rural Lanarkshire, having never been outside Glasgow, and asked when he saw haystacks where the pygmies were.