Dozens of brightly decorated fibreglass cows are dotted around Surrey as part of CowParade Surrey this summer - but two have escaped the herd in search of not-so-green pastures in Waterloo and the South Bank.
The Star Cow – decorated by street artist Pure Evil and raising money for The Neuro Foundation – can be found at the National Theatre on the South Bank.
Another heifer – 'Watermoo' – has taken up residence on the concourse of Waterloo Station.
She was decorated by artist Stacey Allan and a group of young people with cancer from the Royal Marsden Hospital.
"Watermoo is bright and colourful and inspired by nature," said Stacey Allan.
"I wanted to make something eye-catching and uplifting that would make people smile! A flight of swallows arcs across her back, and they are swooping over patches of native Surrey flowers, look underneath and you'll discover a belly-full of wild orchids and bluebells!"
Money raised at auction from Watermoo will support CLIC Sargent, the cancer charity for children and young people.
CLIC Sargent director of fundraising Rachel Kirby-Rider said: "We're delighted that the cow will be auctioned to raise money for CLIC Sargent. The money raised from the sale will go towards our vital work supporting children and young people with cancer, and their families. We provide a range of support from the point of diagnosis onwards through our financial grants, social workers, nurses and free accommodation near hospitals.
"We're also really grateful to our charity partner Network Rail for giving us the opportunity to show off Watermoo to so many of their customers at Waterloo Station."
Jess Skelton, Network Rail sustainability specialist, added: "Waterloo is Britain's busiest railway station, with around 2 million people travelling to and through it each week.
"'Watermoo' is a fantastic way for Network Rail to help raise awareness of our charity of choice CLIC Sargent and the amazing work they do to connect families touched by cancer, keeping them together and connecting them with the support they need."
• Full details at www.cowparadesurreyhills.com