Empire of Animals

I ran across a bit about the ravens of the Tower of London, and how King Charles II ordered that there was to be at least six ravens at the Tower at all times, to forestall the fall of the British Kingdom.

Among all the peoples of the Earth, the British most enjoy taking nonsense seriously. So to this day, there is a full-time Raven Master among the guard at the Tower, and numerous raven understudies are kept in the wings lest tragedy befall the main six.

As I read this, it seemed like Britain had several of these superstitions. A couple quick searches netted:

The London Stone
This is the rock the Romans used to measure distances from throughout their British holdings. According to the BBC, the rock was mentioned in works by Shakespeare, William Blake, and Charles Dickens. The legend is that as long as the stone is safe, London will flourish.

The Barbary Apes of Gibraltar
These monkeys, or possibly apes -- macaques, whatever those are -- live on the rock of Gibraltar. It's said that if anything happens to these monkeys, Britain will lose control of Gibraltar. I've actually been there, and those monkeys don't seem all that politically savvy. I think Britain's put a lot on a longshot here.


Anybody know any other objects or animals that could lead to the downfall of the British empire? Mad cows? Simon Cowell?