Of Nature so much he does claim for to know
But he cannot tell apart a currawong from a crow
A difference that should be not that hard to see
He does not seem that very clever to me
The only similarity between a crow and a currawong is that they both can fly
And the more we think we know the less we do know to him does apply
On a simple thing he had made the wrong call
His type are not rare a self professed know it all
And though he could not tell apart a crow from a currawong
I did not say to him I believe you are wrong
He was convinced the currawong was a crow I thought let it be
Since with the truth of the matter he would not agree
Life and Nature has lessons for us every day
But know it alls never learn as they grow old and gray

Francis Duggan

http://www.poemhunter.com/poem/a-self-professed-know-it-all/