Per Wikipedia "A
proper noun is a
noun that identifies a single entity and is used to refer to that entity, such as
Africa,
Jupiter,
Sarah, or
Amazon, as distinguished from a
common noun, which is a noun that refers to a
class of entities (
continent, planet, person, corporation) and may be used when referring to instances of a specific class (a
continent, another
planet, these
persons, our
corporation)".
So in what respect would a bird species name not fulfil the criteria for a proper noun, per this definition?