1886-1948 1921-2006 1944- aggressivebehaviorinanimals aldo anecdotes angola biography biologists bookchin conservationofnaturalresources deer descriptionandtravel ecology environmentalaspects environmentalism environmentalists fiction forestcanopyecology gordon hempton history human-animalrelationships huntley juvenileliterature leopold morrisk murray nationalparksandreserves naturesounds pioneers plantecologists politicalactivity politicalaspects politicalecology rainforestecology rainforests recordingandreproducing research socialecology southafrica stewartl udall unitedstates war wildernessareas wildlifeconservation wildlifemanagement wildlifemanagers wildliferecovery womenpioneers