Some birds are smarter than about half the niggers. https://www.thoughtco.com/crows-are-more-intelligent-than-you-think-4156896#:~:text=Key%20Points,%2C%20and%20group%20decision%2Dmaking. “In Aesop's fable of "The Crow and the Pitcher", a thirsty crow drops stones into a water pitcher to raise the water level to take a drink. Scientists tested whether crows really are this smart. They placed a floating treat in a deep tube. The crows in the test dropped dense objects into the water until the treat floated within reach. They didn't select objects that would float in the water, nor did they select ones that were too large for the container. Human children gain this understanding of volume displacement around the ages of five to seven.”