My security cam caught a couple of blue jays stealing rocks from my cacti 
I wonder what for.
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Blue Jays are mean creatures and natural born criminals.
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Sometimes Blue Jays will use rocks to knock on your door.
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Maybe they aren’t always the best bird in the world, but they get pretty privilege for their pretty blue color 
So I cut them a little slack
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CHATGPT sez
Blue jays are known to collect and cache various items, including pebbles, as a survival strategy. They might use pebbles to help open seeds, nuts, or fruits. Additionally, these caches of food can serve as a future food source when their primary sources are scarce. The pebbles might also play a role in attracting potential mates or establishing territories.
Crows are smarter 