'''Avibase''' is an online [[taxonomic database]] that organizes [[bird]] [[Taxonomy (biology)|taxonomic]] and distribution data globally. The database relies on the notion of taxonomic concepts<ref>{{cite journal | url=https://doi.org/10.2307/1222443 | doi=10.2307/1222443 | jstor=1222443 | title=The Concept of "Potential Taxa" in Databases | last1=Berendsohn | first1=Walter G. | journal=Taxon | date=1995 | volume=44 | issue=2 | pages=207–212 }}</ref><ref>{{cite journal | url=https://doi.org/10.1089/omi.2006.10.220 | doi=10.1089/omi.2006.10.220 | title=Standard Data Model Representation for Taxonomic Information | date=2006 | last1=Kennedy | first1=J. | last2=Hyam | first2=R. | last3=Kukla | first3=R. | last4=Paterson | first4=T. | journal=OmicsOMICS: A Journal of Integrative Biology | volume=10 | issue=2 | pages=220–230 | pmid=16901230 }}</ref> rather than taxonomic names.<ref>{{cite journal | doi=10.3897/zookeys.420.7089 | issue=420 | doi-access=free | title=Avibase – a database system for managing and organizing taxonomic concepts | date=2014 | last1=Lepage | first1=Denis | last2=Vaidya | first2=Gaurav | last3=Guralnick | first3=Robert | journal=ZooKeys | pages=117–135 | pmid=25061375 | pmc=4109484 | bibcode=2014ZooK..420..117L }}</ref> Avibase incorporates and organizes taxonomic data from the main avian taxonomic publishers (''[[The Clements Checklist of Birds of the World]]'',<ref>[https://www.birds.cornell.edu/clementschecklist/download/ The eBird/Clements Checklist of Birds of the World: v2019] Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2019.</ref> ''[[Handbook of the Birds of the World]]'', [[BirdLife International]],<ref>[http://datazone.birdlife.org/species/taxonomy Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 4.] HBW and BirdLife International (Dec. 2019)</ref> [[IOC World Bird List|IOC Checklist]]<ref>[https://doi.org/10.14344/IOC.ML.10.1 IOC World Bird List (v10.1)] Gill F, D Donsker & P Rasmussen (Eds). 2020.</ref> and the ''[[Howard and Moore Complete Checklist of the Birds of the World]]''<ref>[https://www.howardandmoore.org The Howard and Moore Complete Checklist of the Birds of the World, version 4.1 (Downloadable checklist)] {{Webarchive|url=https://web.archive.org/web/20200603013658/https://www.howardandmoore.org/ |date=2020-06-03 }} Christidis et al. 2018.</ref>) and other regional sources (e.g. all editions of the ''[[American Ornithological Society Checklist of North American Birds]]'' since 1886). Taxonomic concepts in over 230 different taxonomic sources have been mapped and cross-referenced to Avibase concepts.
The website also offers checklists for more than 20,000 geographic regions of the world, species pages with taxonomic information and synonyms, and tools for observers to maintain their own sightings and obtain reports, such as a map showing countries or [[eBird]] hotspots with target species.