This will be a bit of a departure from the norm, since the focus won’t be on the origin of the expression, which was and is used to describe someone who is foolish and scatterbrained. Scientists have made another important contribution to knowledge by studying birds and learned that birds aren’t all that foolish or scatterbrained. “An international consortium of 29 neuroscientists has proposed a drastic renaming of the structures of the bird brain to correctly portray birds as more comparable to mammals in their cognitive ability. The scientists assert that the century-old traditional nomenclature is outdated and does not reflect new molecular, genetic and behavioral studies that reveal the brainpower of birds.” Their studies (how did they get the money to do these studies?) have found birds have all sorts of “cognitive abilities.”
Thanks scientists, for setting us straight! However, I’m guessing if someone does something foolish and/or scatterbrained, they will likely still be called “birdbrain.”