This picture of baby chimps cuddling their keeper is Mr Charlie Adamson has been released to help mark Edinburgh Zoo's 100th birthday.
Pictures taken from the early days at Edinburgh Zoo, such as this photograph of a camel ride, can be seen at an exhibition which runs from 3 April to 31 May. Admission is free.
Zoo visitors watch as penguins arrive at the zoo from Salveson Whaling Company in 1959.
Gilbert Fisher and Joey the King Penguin at Edinburgh Zoo in the early days.
A baby rhinoceros being fed inside its enclosure at the Corstorphine Hill site in Edinburgh.
Queen Elizabeth II and the Duke of Edinburgh watching the penguins parade at Edinburgh Zoo.
This photo of Bactrian camels at the zoo is dated March 1914.
The gates of Edinburgh Zoo first opened to the public on 22 July 1913, four years after the Zoological Society was established by Edinburgh lawyer Thomas Gillespie, seen here with penguins.
A baby chimp attempts to have a wash at Edinburgh Zoo.
