For anyone actually interested in the question of measuring animal intelligence, I recommend the book 'Are we smart enough to know how smart animals are?' by frans de waal.
(And if you care about measuring artificial intelligence, you should definitely care about what we've learned from trying to measure animal intelligence...)
https://www.goodreads.com/book/show/30231743-are-we-smart-en...
(And if you care about measuring artificial intelligence, you should definitely care about what we've learned from trying to measure animal intelligence...)