Gregory's Serveroriginal text appears to have been been picked from results of a variety of studies, although the real studies didn't show as much co-operation between the crows, but proved they could modify the tools themselves.
This is the first one
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Top-level
 original text appears to have been been picked from results of a variety of studies, although the real studies didn't show as much co-operation between the crows, but proved they could modify the tools themselves. This is the first one 1 comment
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@alemioz @SmudgeTheInsultCat
and this it the second (published by a researcher called Christopher Bird 😁 )
https://www.pnas.org/doi/10.1073/pnas.0901008106