In 2014, Brazilian neuroscientist Suzana Herculano-Houzel and her colleagues determined the numbers of neurons and other cells in the brains of eleven species of parrots and fourteen species of songbirds. The brains of birds may be small, says Herculano- Houzel, but they “pack surprisingly high numbers of neurons, really high, with densities at least akin to what we find in primates. And in corvids and parrots, the numbers are even higher.”
