Scale and Smart Birds

This is a little off-topic, but take a look at this link: A visual way to understand scale and the size of small things without having to use analogies.


Since I’m already off topic, here is another thing that I came upon that is quite amazing:   I had heard about Caledonia crows before, where they use the road and cars to crack nuts, but these rooks are creepy smart.  Tool-using and a bit of Archimedes in there as well.


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