When I was a kid, I thought sparrows turned into bats at night which I thought explained why there aren't daytime bats nor nighttime sparrows.
A childhood belief about birds

others believed things like this
- I thought that sparrows were young pigeons.— Daniel
- I used to believe that sparrows were baby pigeons— greenpolyester
- when i was small i thought rats mutated into batsAnon
- i used to believe that black wood ear
came from the skin of the bats— JULIE - I used to believe that moths were a species of bats that only ate the tag on the inside of your shirt— Bob the Baby
- I thought the word mailman was male man and it seemed dumb to me as aren't all men male?— andalite