Louis Lefebvre, professor emeritus of biology at McGill University, explores avian intelligence in his new book *A Bird's IQ*. The work examines how corvids—crows, ravens, and magpies—demonstrate remarkable problem-solving abilities when securing food, challenging assumptions about bird brains.

Research reveals these birds rank among the most innovative in the animal kingdom. The Eurasian carrion crow leads documented innovations, followed by common ravens and Eurasian magpies. Observations include American crows retrieving bats from mine shafts and coordinating fish theft from otters using distraction tactics. Urban crows in Toronto even exploit high-rise windows to catch collision-prone birds.

The book distinguishes between proto-tool use and true tool manipulation, noting that brain size correlates with cognitive complexity. Examples include Indian house crows using stones to crack ping-pong balls and employing leaves as ant-fishing tools. Some behaviors suggest medical understanding, like Hyderabad crows consuming frangipani latex known for antibacterial properties.

These documented cases reveal corvids possess sophisticated cognitive abilities that rival primates, offering insights into evolutionary intelligence development. The research demonstrates that complex problem-solving emerges not from brain size alone, but from adaptive behavioral flexibility in challenging environments.