Pigeons

[Crackle]

Here is a photo of Mildred about to dispose of some droppings. You can just make out the ghostly image of baby standing up in the background.
With mum standing at the front, every time I spoke and said "where's baby" it would stand up and then squat down again.
It was quite amusing, and clearer in real life, my camera just couldn't capture the detail.
   
Mike