For many visitors to London, one of the iconic sights of a trip to the capital is a traditional London red double-decker bus. Known as a Routemaster, these buses was designed in the late 1940s and manufactured until 1968 when production stopped, mainly because their open back doors – which were one of the attractions for many Londoners – made them unusable by those in a wheelchair. They were still used on many routes until the early twenty-first century and some can be seen occasionally on routes such as the Routemaster Heritage Route 15 which runs from Blackwell to Trafalgar Square.

Dinosaurs first appeared on earth nearly 250 million years ago and survived until a mass extinction event around 65 million years ago. This means that they were dominant animals on the planet for over 150 million years – far longer than human beings. Most scientists believe that the mass extinction of the dinosaurs was caused by a meteor landing on earth.