"Land birds" refers to birds that primarily live, nest, and fly on land, such as sparrows, pigeons, robins, and crows. They do not spend much time in water like ducks or swans do. Full definition
The climatic conditions needed by 285 species of land birds in the United States have moved rapidly between 1950 and 2011 as a result of... (news.wisc.edu)
Population trends of North Finnish land birds in relation to their habitat selection and changes in forest structure. (en.wikipedia.org)
A new report from Partners in Flight shows that about 17 % of North American land bird species (148 of 882 species) are facing rapid declines, due not in small part due to habitat loss in their winter (treehugger.com)