Salvin`s prion, Pachyptila salvini, also known as medium-billed prion, is a species of seabird in the petrel family Procellariidae. ==Taxonomy== Salvin`s prion is a member of the Pachyptila genus, and along with the blue petrel, they make up the prions. They in turn are members of the Procellariidae family, and the Procellariiformes order. The p.....