Why Are Crows So Smart: an exploration & explanation of crows' high intelligence - World Birds
On average, how smart are birds compared to mammals, excluding humans? - Quora
TIL that elephants are so complex they are able to mourn, cry, have mental breakdowns, play the drums, paint, mimic humans' speech and show basic arithmetic skills. : r/todayilearned
Crows possess higher intelligence long thought primarily human - STAT
On average, how smart are birds compared to mammals, excluding humans? - Quora
ELI5: Why haven't other species evolved to be as intelligent as humans? : r /explainlikeimfive
Crows Could be the Key to Helping Humanity Understand Alien Intelligence
Are We Smart Enough to Know How Smart Animals Are?' and 'The Genius of Birds' - The New York Times
Orangutans Got Suspiciously Close to Inventing Stone Tools in New Zoo Experiments : r/science
Crows Are Self-Aware Just Like Humans