On the Existence of Ornithologists

For a bird to be that – a bird – it must possess a number of more or less essential qualities. There are certain sorts of humans that know with certainty what these more or less essential qualities are. These certain sorts of humans are known as ornithologists. Why anyone would want to know the more or less essential qualities of these creatures – birds – I cannot say with any degree of certainty. That they exist, however, is irrefutable.