My dad told me that robins were just sparrows with the cold (and that's why they had red breasts). Why would I not believe him - you only see robins in the winter.
I only found out it wasn't true when mentioned this on seeing a robin to my friends...at uni...when I was 18...
A childhood belief about birds

others believed things like this
- I believed that Robins hibernated throughout the year and only came out at christmas. Anon
- I used to think House Finches were baby birds and they'd later grow into Robins or something— Mica
- I used to think that if you ate cat food you would die. I found out it wasn't true
— Bob#4 - I used to think "Robin Hood and his merry men" was "Robin Hood and his *married* men."Anon
- I used to believe that sparrows were baby pigeons— greenpolyester
- I thought that sparrows were young pigeons.— Daniel