There are two possibilities: they're not more intelligent than crows, or they are in a way that is not clear to us.
https://www.rifters.com/crawl/?p=6116
That one is downright spooky, especially for its bizarre implications if you take it seriously.
https://www.gwern.net/Hydrocephalus#problems-with-the-case-s...
There are two possibilities: they're not more intelligent than crows, or they are in a way that is not clear to us.