This historically significant collection of ornithological books is named after its collector, Jacob (also Jakob) Moyat (1861–1933) of Mainz, and contains approximately 1,200 titles dating from the 16th to the 20th century. According to ornithologist Rolf Schlenker (1937–2023), it is an immeasurable treasure for specialists, as it encompasses not only the complete body of relevant literature on ornithology available in Moyat’s time—ranging from the most famous and valuable illustrated volumes to the small-format, often unillustrated books on bird trapping and birdkeeping, which are extremely rare today— It also contains unique handwritten sources, such as the ornithological diary of Friedrich Heinrich von Kittlitz (1799–1874), written between 1816 and 1824, partly in the region around Mainz, and the manuscript on the birds of the Province of Brandenburg by Hermann Hocke (1844–1910).

The exhibition features both particularly beautiful and particularly rare items from the collection.