The zoological collections are among the largest and most comprehensive in the world. Holdings include millions of specimens in dry storage (such as bones, feathers, shells, pinned insects), fluid-preserved specimens for anatomical research, frozen tissues for DNA studies, as well as numerous other special collections. In addition to forming the basis for research by Field Museum's zoologists, this enormous resource is utilized by scientists from around the world. Zoology Collections: Amphibians and Reptiles | Birds | Fishes | Insects | Invertebrates | Mammals