A canine cancer originated in a prehistoric inbred dog, which led to the spread of the disease all around the globe.
An extremely elusive creature called a bay cat has been photographed in stunning detail in its native Borneo in Southeast Asia.
The tiny creatures set up a chilly home in the ice and stick their tentacles out to feed.
Is an animal more likely to fight or make love? A new study identifies the fighters, the lovers and those who are in between.
A quarter of the world's sharks and rays are at risk of extinction, according to a new assessment.