Where do we currently stand with regards to our knowledge of animal intelligence? Do popular beliefs reflect scientific evidence? Are dolphins and killer whales the smartest animals? My next post will explore these questions. In the meantime, here are a few numbers to consider.

I searched for scientific literature regarding animal intelligence and behavior using PubMed and Google Scholar.

PubMed comprises more than 23 million citations for literature from MEDLINE, life science journals, and online books, and is considered the gold standard for searching for