The elusive saola, or two-horned unicorn, is cited to be one the rarest large animals on Earth, and has yet to been seen in the wild by a biologist!
Fact file: Saola (Pseudoryx nghetinhensis)

Saving weird and wonderful animals from extinction
The elusive saola, or two-horned unicorn, is cited to be one the rarest large animals on Earth, and has yet to been seen in the wild by a biologist!
As exemplary parents, the Maleo cooks its chicks in geothermal sands until they are just right.
The cork-bark leaf-tail gecko is a master of disguise, but despite its perfect camouflage it can’t hide from habitat destruction.
You should probably know that unlike most other turtles, Mary River turtles breathe with their butts!
The Hispaniolan Solenodon is a shrew-like mammal that has been around since the age of the dinosaurs. They are found only on the island of Hispaniola in the Dominican Republic and also in parts of southern Haiti. They tend to live in moist forest areas.
It is vital that modern trafficking is halted as soon as possible to ensure the Sunda pangolin’s continued existence as a species. With enough immediate action we may be able to prevent our tiny knights from going extinct, like so many animals before them.
On top of being adorable, these animals are quite unique in many aspects. All four species of echidna, along with their close relatives, the platypus, are known as monotremes, and they are the only mammals to lay eggs rather than give birth to live young.
The entirely aquatic salamander, known as the olm (Proteus anguinus), is Europe’s most impressive cave-dwelling vertebrate. Or, more accurately, it is Europe’s only cave-dwelling vertebrate.
The Philippine eagle is one of the largest and rarest eagles in the world. This avian wonder is critically endangered and at risk of being lost from our world forever. Habitat loss and human conflict has meant that the remaining 400 pairs can only be found on four islands in the Philippines.
In the past 30 years, the scalloped hammerhead shark population in the Atlantic Ocean has declined by 95%. Devastatingly, last year, they were listed as critically endangered due to its decimated population. If we lose the scalloped hammerhead from our oceans, not only will there be devastating effects on the marine ecosystem, we will have lost a unique piece of biodiversity that cannot be replaced.