Unearth ancient secrets and walk with dinosaurs and other weird and wonderful creatures that time forgot including T. rex, mammoths and terror birds.
Find out more about your favourite prehistoric
Our giant of a host, Eric Schulze, explains why size mattered in prehistory.
The largest prehistoric organisms include both vertebrate and invertebrate species. Many are described below, along with their typical range of size (for the general dates of extinction, see the link