From incredibly preserved extinct megafauna like the woolly rhino, to the 40,000-year-old remains of a giant wolf, and bacteria over 750,000 years old.

Not all of these things are dead.

Centuries-old moss was able to spring back to life in the warmth of the laboratory. So too, incredibly, were tiny 42,000-year-old roundworms.

These fascinating glimpses of organisms from Earth's long distant past are revealing the history of ancient ecosystems, including details of the environments in which they existed.