Raven Intelligence

Future Planning

[science] In 2017, Kabadayi and Osvath published a landmark study in Science showing ravens planned for a future need. Ravens were shown a tool that opened a food box. After the box was removed, they were offered a tray of objects — including the tool — without the box present. After a delay of up to 17 hours, they were given the box again. Most ravens selected the correct tool and used it to get the food.

Crucially, the study used the exact same experimental protocol previously used with great apes — allowing direct comparison. Ravens performed comparably to orangutans and bonobos. The study attracted wide attention because "planning for the future" had been considered a uniquely human or near-human cognitive ability.¹

Theory of Mind — Knowing What Others Know

[science] Ravens re-hide cached food when they suspect a competitor has watched them cache it. Bugnyar and Heinrich (2005) showed this is not a simple response to being watched — it involves the caching bird assessing whether the observer could have seen the caching event, based on the observer's position relative to the cache.²

[science] A subsequent study (Bugnyar et al., 2016) tested whether ravens understand gaze. Ravens caching in a room would re-cache if a sound suggested a competitor was present and a peephole was open — even when no competitor was visible. They behaved as if they understood that an open peephole enabled vision. This is consistent with a rudimentary theory of mind.³

Cooperation and Fairness

[science] Ravens cooperate on tasks requiring simultaneous action. Massen et al. (2015) showed ravens will coordinate with a partner to pull both ends of a rope simultaneously to obtain food. More remarkably, they adjust their cooperation based on reward equity — they are less willing to cooperate when their partner receives a better reward for the same effort, suggesting sensitivity to fairness.⁴

Social Learning

[science] Ravens learn from each other. When one raven discovers a novel method of obtaining food, others in the group learn the technique faster than they would by trial and error alone. This social transmission of information has been documented in captive groups and inferred from wild populations.⁵

Social learning is thought to be one of the key drivers of corvid intelligence generally — living in complex social groups with long-term relationships selects for the ability to track others' knowledge, intentions, and reliability.

What Drives Raven Intelligence?

[science] Ravens have one of the highest brain-to-body ratios among birds. Their social system — involving long-term pair bonds, complex non-breeding flocks, competition over caches, and cooperation with predators — creates a cognitive "social arms race" that may have selected for increasingly sophisticated mental abilities. The same hypothesis is used to explain high intelligence in great apes and humans.⁵

What Ravens Cannot Do (Known Limits)

• Ravens do not use tools reliably in the wild (unlike New Caledonian Crows).
• Ravens do not appear to understand the symbolic or semantic content of human words they mimic (unlike some trained African Grey Parrots).
• Ravens show social learning but it is not clear they can innovate at the same rate as some parrot species in certain task types.

These are not criticisms — they are simply the current limits of what has been tested. The raven cognitive literature is growing rapidly and new abilities are regularly documented.