Which among the following is not an extinct species ?

Dodo (Mauritius) Thylacine (Australia) Steller’s Sea Cow (Russia) Vaquita

Vaquita

On the brink of extinction, the vaquita is the smallest living species of cetacean. The single rarest animal in the world is the vaquita (Phocoena sinus). This porpoise lives only in the extreme northwestern corner of the Gulf of California in Mexico.