I Have a Question

My Brother paid me a visit this morning and we were outside looking at my daisies when he asked "Have you been throwing your clothes pegs on the roof?" What?! Haha Sure enough there were at least 10 clothes pegs on the roof. I hadn't thrown any there and there were none missing when I brought my washing in. Where did they come from? I can only assume it was a bird who dropped them there but I have absolutely no idea where they came from. They haven't faded so it must have been fairly recently. Silly birds huh? lol