Avibase

Database including information on distribution, taxonomy, and synonyms for birds.

Data location: http://avibase.bsc-eoc.org/

Uses: Of particular interest is the tool for comparing two differt checklists. This provides information to help combine datasets that are based on different taxonomies, and the determine what has changed from one version of the taxonomy to the next. In particular, this is one of the only sources that allows for readily evaluating whether or not splits have occured that may influence an analysis (e.g., species A was only a single species when the data was collected but may now be species A or species B or species C).