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Recently，researchers investigated the foraging profiles of bird species in two separate eucalypt forests in Australia Dryandra in Western Australia and the Southern Tablelands，roughly 3000 km east in New South Wales. Despite their geographical separation，there is a broad overlap in species between the two locations. However，at Dryandra，a much larger proportion of species (61 percent) than at the Southern Tablelands (34 percent) are ground foragers.
The high proportion of ground forages in Dryandra might be explained by the openness of habitats there，that is，the absence of dense ground vegetation，and the lack of a continuous shrub layer. Ground foraging appears to be facilitated by an open habitat with areas of bare ground. However，the researchers found that the Tablelands were also open with sparse to dense litter layers，abundant in woody debris，and had discontinuous or absent ground and shrub layers. Thus，differences in habitat structures between these areas and Dryandra cannot entirely explain the greater abundance of ground foragers in Dryandra.
The researchers...