Found towards the south west of the city limits, the forest was the scene of Poland's worst air crash on the May 9, 1987. A memorial stone pays tribute to the 183 people who died. The forest is also believed to be the hiding place of a warthog that escaped from Warsaw Zoo while being transported to start a new life in San Diego. Locals have named the fugitive Non Diego. Officially marked as a nature reserve since 1980 the 900 hectare park lies within easy reach of Kabaty metro stop the area is home to owls, kestrels, deer, boar, foxes and the European Tree Frog. A popular hideout for Home Army soldiers during WWII the reserve is also home to many mass graves dating from this time, and is also one of the spots where Polish scientists worked on cracking the Enigma code.