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
If you study the pidgins for a bit you will notice that they sometimes pick up things in their beak that they spit out again. Especially if things are frantic as people throw food at the ground. So they are not perfect. But they are closer to the ground then you and have better eyesight then you. So they have a much easier time seeing what is on the ground and can usually see if it have the texture of bread or seed or if it have the texture of a pebble.
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