People relax in St. James's Park, ahead of lockdown restrictions being eased, amid the spread of the coronavirus disease (COVID-19) pandemic, London, Britain, March 27, 2021. REUTERS/Toby Melville 

Pelicans are seen in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley TPX IMAGES OF THE DAY 

A group of pelicans pass a boy on a scooter in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley 

Two pelicans pass people sat on benches in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley 

Pelicans are seen in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley 

A moorhen is seen in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley 

A pelican is seen in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley 

A group of pelicans pass a man in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley 

A man looks at a group of pelicans in St James' Park, following the outbreak of the coronavirus disease (COVID-19), London, Britain, April 27, 2020. REUTERS/John Sibley 

Parakeets compete for food from a visitor in St James's Park in London, Britain, February 27, 2019. REUTERS/Toby Melville 

Parakeets compete for food from a visitor in St James's Park in London, Britain, February 27, 2019. REUTERS/Toby Melville 

Parakeets compete for food from a visitor in St James's Park in London, Britain, February 27, 2019. REUTERS/Toby Melville 

Two women take photos in the snow in St James's Park in London, Britain, February 27, 2018. REUTERS/Peter Summers 

Two girls take photos in the snow in St James's Park in London, Britain, February 27, 2018. REUTERS/Peter Summers 

People relax in deck chairs as they enjoy the sunshine in St James Park in London, Britain September 27, 2015. REUTERS/Neil Hall 

A woman rests in the sunshine in St James Park in London, Britain September 27, 2015. REUTERS/Neil Hall 

A woman walks through a pile of autumn leaves at St James's Park in London October 27, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT) 

An autumn leaf leaf floats beneath the water surface of the lake at St James's Park in London October 27, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT) 

A black swan tucks its beak into its wing during autumn at St James's Park in London October 27, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT ANIMALS) 

A squirrel eats a nut among a pile of autumn leaves at St James's Park in London October 27, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT ANIMALS) 

A squirrel eats a nut among a pile of autumn leaves at St James's Park in London October 27, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT ANIMALS TPX IMAGES OF THE DAY) 

Joggers run along an avenue of trees during autumn at St James's Park in London October 27, 2013. REUTERS/Luke MacGregor (BRITAIN - Tags: ENVIRONMENT SPORT) 

Men sunbathe in St Jame's Park in central London September 27, 2011. REUTERS/Paul Hackett (BRITAIN - Tags: ENVIRONMENT SOCIETY)