Amur Leopard: Often described as the world's rarest cat, this leopard subspecies found in Russia and China, has extremely low numbers, primarily due to habitat loss and poaching.

Sumatran Rhino: Native to Sumatra, Indonesia, this critically endangered rhino is staring at extinction due to habitat loss and poaching.

Vaquita: A tiny porpoise found only in Mexico's Gulf of California, Vaquita has extremely low numbers, and is critically endangered due to illegal fishing.

Cross River Gorilla: A Gorilla subspecies found in the border region of Nigeria and Cameroon, the Cross River Gorilla is endangered due to habitat loss, and hunting.

Javan Rhino: Native to Indonesia, the Javan Rhinocerous is left with a very small population confined to the country's Ujung Kulon National Park. The Javan Rhino faces existential threats from habitat loss and poaching.

Saola: Aka the "Asian unicorn", this elusive mammal found in Vietnam and Laos is incredibly rare, with very little known about its population.

Pangolins: The most illegally trafficked mammal in the world, Pangolins have several species and sub-species, and all of them are critically endangered.