Negative emotional contagion and cognitive bias in common ravens (Corvus corax) Jessie E. C. Adriaense, Jordan S. Martin, Martina Schiestl, Claus Lamm, and Thomas Bugnyar Though they seem generally positive,
Choose your title: "Negative emotional contagion and cognitive bias in common ravens (Corvus corax) " Or, as puts it: "A sad raven bums out its friends" Either way, this long-time Raven lover loved it.
Negative emotional contagion and cognitive bias in common ravens (Corvus corax) | PNAS