Dr. Smith has discovered a bird that he believes is a new species. Dr. Wilson says he will only be convinced if Dr. Smith finds several more birds of the same type. Why might Dr. Wilson feel this way?

A) He wants to be sure Dr. Smith hasn't killed the last one and made the species extinct.
B) He wants to be sure that the bird Dr. Smith found isn't just an unusual example of an already-described species.
C) He wants to make sure that there will be enough specimens for many scientists to study the bird and see if it is a new species.
D) All the bird species have already been described, so there can't be anymore.