A California Gulf porpoise, also known as a vaquita, monument (R) is seen in San Felipe in Mexico's state of Baja California March 7, 2008, The vaquita, a tiny stubby-nosed porpoise found only in Mexico's Sea of Cortez, is on the brink of extinction as more die each year in fishing nets than are being born, biologists say. Picture taken March 7, 2008. REUTERS/Henry Romero(MEXICO)