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A study published in Scientific Reports, from Nature, revealed that crows possess cognitive abilities comparable to those of primates and four-year-old children, including abstract reasoning, future planning, and tool-making. Crows demonstrated the ability to delay immediate rewards in favor of useful tools for the next day, memorize hundreds of food hiding places, and recognize human faces that pose a threat. The discovery challenges the belief that small brains limit intellectual capacity, proving that the neuronal density of the avian brain allows sophisticated behaviors that science attributed only to large mammals.
Crows are forcing science to rewrite what was known about the limits of animal intelligence. A study published in Scientific Reports, from Nature, demonstrated that these birds possess extraordinary cognitive abilities that include abstract reasoning, planning future actions, and using custom-made tools. Crows solve problems with cognitive flexibility comparable to that of chimpanzees and four-year-old children, despite having a brain that fits on the tip of a finger, a feat that overturns the theory that only large mammals are capable of complex thinking.
The discovery redefines scientific understanding of brain evolution. Researchers demonstrated that the neuronal mapping of crows reveals a density of connections in the prosencephalic areas extremely concentrated, which compensates for the reduced brain size. This optimization allows processing speed that favors the analytical capacity of crows and explains how birds with such small brain mass can exhibit behaviors that science considered exclusive to primates and large mammals.
What crows can do with a tiny brain
Crows memorize the exact location of hundreds of food caches, a skill that requires long-term spatial memory and the ability to constantly update information. In controlled tests, crows demonstrated the ability to modify twigs and wires to create custom hooks, tools mentally designed before being crafted, confirming the existence of logical deductive reasoning.
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Besides tool use, crows recognize specific human faces that pose a threat and pass this information to other group members, demonstrating cultural transmission of complex knowledge.
Researchers observed that crows that had never had direct contact with a particular researcher began to avoid him after receiving “alerts” from other individuals, a social behavior that presupposes sophisticated communication among the birds.
Crows that plan for the future
Self-control experiments provided evidence that crows can accurately anticipate future scenarios. In laboratory tests, crows were able to ignore an immediate reward and save a specific tool that would only be useful the next day, demonstrating the ability to delay gratification and plan actions with a horizon of up to 24 hours.
This planning ability follows a defined cognitive flow: first, the crow identifies the problem and evaluates the available tools; then, it saves specific objects thinking about future needs; finally, it executes the exchange of the saved item for the reward.
The level of sophistication of this process is rarely observed outside the primate group, and the fact that it occurs in birds with small brains raises fundamental questions about what determines intelligence.
Crows versus primates and children
Comparative psychology tests placed crows alongside chimpanzees and human children in cognitive challenges. Crows negotiate objects with ease comparable to that of a four-year-old child, understand the value of an abstract item, and keep it to exchange for food, behavior that requires understanding of symbolic value and social exchange.
When compared to chimpanzees in mechanical problems, crows demonstrate similar problem-solving abilities. The difference is that chimpanzees use a brain weighing approximately 400 grams for these tasks, while the brain of crows weighs about 15 grams. The ratio between cognitive result and brain mass of crows is, by this metric, incomparably superior to that of any primate.
Why Brain Size Doesn’t Matter
The belief that small brains produce limited intelligence has been disproven by data. The neuronal density in the prosencephalic areas of crows is extremely concentrated, with compacted connections that allow for rapid information processing and decisions adapted to adverse situations, a capability that does not depend on brain volume, but on architectural efficiency.
The use of complex tools by crows, where twigs and wires are modified into hooks mentally designed before manufacturing, requires a prior mental representation of the desired object.
For science, this means that crows possess something equivalent to a mental model of the world, a capability that was considered exclusive to primates with brains hundreds of times larger. The conclusion of the study is clear: evolution has found more than one path to intelligence.
Did you know that crows plan for the future, make tools, and recognize human faces with a brain the size of a walnut? What impresses you more: the memory of hundreds of hiding places, self-control, or the comparison with four-year-old children? Tell us in the comments.
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