What do pigeons naturally eat?

[Coldemort]

Just realised that theres a distinct lack of crisps/chips/fag ends in the local park.
So what are the pigeons going to eat? There must have been a time without crisp-fed pigeons...

The ones in my garden are sitting on the little cherry tree and eating something on there. Not sure if it is blossom or little insects on the tree or the budding leaves.

It'll be interesting to observe the effects on wildlife. Saw 2 ducks walking down the high street yesterday
Maybe this will be like pigeon bootcamp

We get a few who scoff the sunflower hearts we put out. They also eat the berries from one of the trees in the garden and something from one of the bushes which is amusing to watch as the branches don't support their weight so they flap around.