I remember believing as a child that horses and cows were the same species;
the horse was the male, and the cow was the female.
A childhood belief about general

others believed things like this
- When I was little I thought cows married horses, cows were all female and horses were all male. — Sheila
- I used to believe, as a child, that horses were male cows.— Martin Taylor
- I used to think that to desex an animal meant to turn it from a male to a female or female to male.— Phil
- I believe there are horses making the car go fast when people told me the horse power of a car.— Jake
- I used to believe cows were ugly horses— Marlene
- I used to believe that milk came from cows, so water came from horses. hahah— Melissa O'Connor