The bird collections include 1,800 mounted British specimens, 400 foreign birds and over 1,100 cabinet skins. There are also 300 birds’ nests and a collection of bird's eggs covering most species on the British list. The Herbarium contains approximately 30,000 specimens representative of the flora of the British Isles. There is also a British collection of some 6,000 specimens of critical genera including Rubus, Taraxacum and Hieracium. The Herbarium collection is the basis of Philp's Atlas of the Kent Flora. There is an entomology collection of around 250,000 specimens forming a comprehensive collection of British insects; and an important collection of several thousand shells, mainly of tropical marine origin, but including temperate marine and freshwater, and tropical terrestrial species.