How much do we know about the millions of strange and fascinating animals that had already vanished from the Earth before the coming of Man?

Most of the spectacular dinosaur skeletons familiar to us today were unearthed in a frenzy of scientific effort in the last years of the 19th century.
Introduced by Dr Alan Charig, Curator of Fossil Amphibians, Reptiles and Birds at the British Museum (Natural History), London.