I did a psych/neuroscience comajor about 20 years ago, and I remember comparitive neuroscience, showing that in general, as the animal's brain gets more complex

I did a psych/neuroscience comajor about 20 years ago, and I remember comparitive neuroscience, showing that in general, as the animal's brain gets more complex, so does intelligence. Parrots and crows were recognised as outliers to this trend - they showed intelligence that bucked the trend, given the complexity of the brain. They're not the smartest animals around, but they do buck the trend in terms of neural complexity.