title: Problems of studying extinction risks.
authors.forename: David
authors.initials: D
authors.lastname: Putland
mesh_terms: D000818:Animals; D049628:Body Size; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004777:Environment; D008322:Mammals / Q000033:anatomy & histology / Q000145:classification / Q000502:physiology; D010802:Phylogeny; D011156:Population Density; D012306:Risk