Which animals have entered the 'Stone Age'?

Jan 18, 2023
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Many years ago I was on the tip of Long Island NY. There was a concrete bridge crossing one of the arms of the inlet. The seagulls found that they could put a clam in their mouths, fly high over the bridge and drop the clam on the cement thus breaking the shell. Hmmm, raw clams.

Question; is this a tool? I might give up my cat for a pet seagull.

JB
 
Nov 28, 2019
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The article mentions Thai macaques using tools in the past: " These tools were likely employed between 1950 and 2004, according to a 2016 paper...
I can't remember which Thai island that I was on in 2012, I lived various places in Thailand for 3 years, however I watched these macaques use rocks to break open mussels. This was apparently 8 years after researchers last saw this behavior. Hopefully, they still do this.