Pelicans have been living in St James's Park for nearly 350 years. They were first introduced in 1664, as a gift to King Charles II from the Russian Ambassador.
The existing pelicans are gregarious creatures and can often be seen climbing out of the lake to sit on benches alongside visitors.
One rather mischievous bird used to fly over to London Zoo in Regent's Park to steal their fish for his lunch.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.