Studies: Crows count, chimps know when they're right
J. Intell., Free Full-Text
Young Ravens Rival Adult Chimps in a Big Test of General
Ravens can be as clever as chimps
Common Raven (U.S. National Park Service)
Kids surpass intelligence of chimps at the age of four
Great Apes' Biggest Threat Is Human Activity, Not Habitat Loss
Ravens parallel great apes in physical and social cognitive skills
See 14 animals that have shown us their impressive smarts