title: Expiry dates.
authors: Stuart
authors: S
authors: Pimm
mesh_terms: D000818:Animals; D044822:Biodiversity; D001717:Birds / Q000502:physiology*; D003247:Conservation of Natural Resources / Q000379:methods; D025061:Dinosaurs / Q000502:physiology; D005580:Fossils; D006802:Human Activities; D008954:Models, Biological; D011156:Population Density; D016008:Statistical Distributions; D013997:Time Factors