Estimates of bird intelligence keep being revised upwards.
Studies of the African Grey parrots have demonstrated intellingence equal to that of a chimp...or a three year old child.
The bigger parrots have not been studied as intensively.
But there are quite a number of experts that think the corvids ( r, crows, magpies and others) may be the most intelligent of all.
Some have been observed not just using tool...but MAKING them!
A study published by National Geographic suggests that some crows are better at making tools than chimps.
Be kind to all animals...they are much more intelligent and sensitive than we have been taught...