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Morphological diversity within closely related species is an essential aspect of evolution and adaptation. Mutations in the… Expand Experimental evidence of trophic cascades initiated by large vertebrate predators is rare in terrestrial ecosystems. A… Expand The new Canid Action Plan synthesizes the current knowledge on the biology, ecology and status of all wild canid species, and… Expand Wolves are some of the world's most charismatic and controversial animals, capturing the imaginations of their friends and foes… Expand The present investigations were undertaken to compare interspecific communicative abilities of dogs and wolves, which were… Expand Abstract With gray wolves restored to Yellowstone National Park, this ecosystem once again supports the full native array of… Expand The wolf population in Scandinavia has increased from functionally extinct to about 100 wolves since the 1970s. In 2001 we… Expand The elk or wapiti (Cervus elaphus) and bison (Bison bison) of Yellowstone National Park have lived in an environment free of… Expand Quaking aspen (Populus tremuloides) biomass has declined in Yellowstone National Park (YNP) in the past century. We installed… Expand Investigation of tree growth in Isle Royale National Park in Michigan revealed the influence of herbivores and carnivores on… Expand