In order to determine avian species composition and densities in a given area it is necessary to systematically inventory the habitat (s). Three basic types of data can be collected. First, species occurrence information indicates distribution by habitat type. Second, relative density data provides insight into which species are the most common and which are the most rare. Third, absolute density data provides information on how many birds of each individual species utilize a given habitat as well as total numbers of individuals which the habitat is supporting. Of these three inventory types, the latter is the most important because its results indicate the degree to which a given habitat type is being utilized and hence, permits a system of prioritizing habitats on the basis of avian usage. In addition, diversity values such as H' (see Shannon 1948) may be calculated from density data. The purpose of this Technical Note is to review the major inventory techniques currently in use for birds. Information regarding how to collect field data, analyze it, and display the results is also included. In addition, where two or more methods are applicable to a particular situation, advantages and disadvantages of each method will be discussed.