I thought that hens and chickens were the same thing and that cocks were a different breed of bird! I was very surprised to learn that cocks and hens were simply male and female chickens when I was 10
A childhood belief about birds

others believed things like this
- I believed that chickens pooped eggs (male and female)— WHAT-A-Doodle-WHO??
- I used to believe that chickens reproduced A sexually and that roosters were just handicapped chickens. — Teena Strang
- I used to think that turkeys were male chickens. Don't know why, but I did.— Felicia
- when I was a kid. I used to believe hens had teeth.— lév michot
- I thought when Grandma's hens were cackling, they were giggling about some private joke in the henhouse. — Not a farm kid
- i used to believe that sausages were to pigs as eggs are to hens— stuart swanston