sentences:  The collection diminished severely and consisted in 1921 only of 565 animals.In 1938 the zoo became the property of the city of Königsberg, and the Tiergarten society was dissolved.After the war, the last director of the Königsberg Zoo, Hans Georg Tinemann (the son of the well-known ornithologist and pioneer of bird ringing) became director of a zoo in Duisburg, the sister city of Königsberg.