Modern science believes it knows most major large animals in the world today.
Most areas on Earth have been explored, most places have been mapped and surveyed. Despite all this, reports of strange, unknown creatures have come from all over the world. The most recent mass sighting of an unknown creature is taking place in Puerto Rico. A. Cryptozoology is literally the study of unknown creatures, whether in the land air or sea. A few have, the most notable, the Coelacanth, a fish which had been thought to have been extict for 65 million years.