The disadvantage of using common names for species is that

Species is a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The species is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial, e.g. Homo sapiens. The disadvantage of using common name for species is that the names may change, one name does not apply universally, one species may have several common names and one common name may be applied to two species.