Charles Darwin was right with his theory of 'living fossils', when Charles Darwin invented the term "living fossils" in 1859, he was thinking of living species that resemble his ancestors millions of years ago. His explanation was that they occupied small parts of the world, escaping competition, and therefore did not change.
Finding evidence such as Giant Sloths, breeds of horses, and hippos in environments which no longer had those existing animals was proof that survival of the fittest was important in climate changing locations.
