""Are We Smart Enough To Know How Smart Animals Are?" by Frans De Wal is an interesting book about our growing ability to recognize intelligence in others.  <a href=""https://www.amazon.com/Are-Smart-Enough-Know-Animals-ebook/dp/B01BXSB8DA"">https://www.amazon.com/Are-Smart-Enough-Know-Animals-ebook/dp/B01BXSB8DA</a>"