I have to agree but not just the crows.. The two parakeets that I owned as a kid were quite smart and would stir their own seeds to move the good seeds above the spent seeds with tooth pick that I had been using to scratch them. They would play with the tooth pick and grab it from each other. And they were affectionate and liked to snuggle.

They had complete trust in my family and not others. So they could tell the difference.

Intelligence is not about some IQ test.