You see pigeons and other birds go mad when a bunch of breadcrumbs are thrown on the ground, but seem to know not to go for small rocks, earth, and other non edible things even if they were to be thrown in the same way.
Maybe I’m just underestimating the intelligence of pigeons or their keen eyesight? But they seem to know almost instantly what they can and can’t eat.
In: Biology
The short answer is that they have excellent vision. City birds like pigeons can see worms in the dirt from the air. Imagine looking at a piece of bread and a small rock under a magnifying glass. It would be extremely easy to tell them apart.
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