ABSTRACT
Many birds that breed in North America and Eurasia spend up to 7 months each year in tropical areas of Latin America, Africa, and the Indomalaysian Region. As in temperate areas, censusing problems derive from peculiarities associated with physical environment, vegetation characteristics, and peculiarities of avian natural history. A primary consideration in censusing of migrants is the reality that each species survives in its wintering area through a unique complex of behavioral and ecological attributes. The strip census procedure involves walking along an established transect route while counting all birds seen within some distance of the transect. Normally, transect widths are about 10 m on each side in forest and up to 30 m in open grassland. Another popular census procedure involves use of mist nets.
