Animals perform tricks for Halloween treats

Siberian tiger Ingrid and her four-month-old cubs, Rosa (left) and Zaria, investigate a pumpkin at Port Lympne wild animal park in Kent Photograph: Gareth Fuller/PA

Rosa pounces on the pumpkin Photograph: Gareth Fuller/PA

Chimpanzee Blossom eyes up a pumpkin in her enclosure at Blair Drummond safari park in Scotland Photograph: Andrew Milligan/PA

Foufou, a western lowland gorilla, with her two-year-old baby Louna, plays with a pumpkin at Port Lympne wild animal park Photograph: Gareth Fuller/PA

A ring-tailed lemur inspects a pumpkin at the Bioparco zoo in Rome, Italy Photograph: Di Giovanni/EPA

A northern plains grey langur plays with a carved pumpkin at Nyiregyhaza animal park in Nyiregyhaza, Hungary Photograph: Attila Balazs/EPA

A Japanese macaque plays with a pumpkin at the Bioparco zoo Photograph: Di Giovanni/EPA

Japanese macaques sit above a pumpkin at the Bioparco zoo Photograph: Di Giovanni/EPA

An orangutan nibbles a pumpkin at the Tierpark Hagenbeck in Hamburg, Germany Photograph: Angelika Warmuth/EPA

A red-crowned crane, also called a Japanese crane or Manchurian crane, takes a bite from a Halloween pumpkin at Nyiregyhaza animal park Photograph: Attila Balazs/AP

An orangutan eats a pumkin in her enclosure in the Tierpark Hagenbeck Photograph: Angelika Warmuth/AFP/Getty Images

Two orangutans share a pumkin in their enclosure in the Tierpark Hagenbeck Photograph: Angelika Warmuth/AFP/Getty Images