Nature's wonders often defy human logic. Animals possess astonishing abilities honed by evolution for survival. Octopuses have three hearts, while tardigrades endure extreme conditions. Dolphins ...

The more noticeable ones, however, can produce features that are quite rare for the species. To give you a sense of how these fascinating genetic quirks show up in nature, we’ve put together a gallery ...

They may be the size of a Shetland pony and weigh up to 275kg (600lb) but pigmy hippos are very hard to spot in the wild. In ...