1. Taxonomic & data-quality challenges of large-scale citizen science: Examples from Marshall J. Iliff, eBird Project Leader

6. Observations Checklists Growth in eBird Observations & Checklists

7. In 2009, volunteers contributed more than 780,000 hours collecting bird observations.

8. The eBird Taxonomy (v1.05) User familiarity is the goal Familiar Clements 6.4 is base global taxonomy Follows recognized regional authorities for taxonomic and nomenclatural decisions Standardized English and Scientific Names for all taxa Translations in other languages http://ebird.org/content/ebird/about/ebird- taxonomy for download Personal support for taxonomic questions

9. The eBird Taxonomy (v1.05) User familiarity is the goal Familiar Clements 6.4 is base global taxonomy Follows recognized regional authorities for taxonomic and nomenclatural decisions Standardized English and Scientific Names for all taxa Translations in other languages http://ebird.org/content/ebird/about/ebird- taxonomy for download Personal support for taxonomic questions

10. The eBird Taxonomy (v1.05) User familiarity is the goal Familiar Clements 6.4 is base global taxonomy Follows recognized regional authorities for taxonomic and nomenclatural decisions Standardized English and Scientific Names for all taxa Translations in other languages http://ebird.org/content/ebird/about/ebird- taxonomy for download Personal support for taxonomic questions

11. The eBird Taxonomy (v1.05) User familiarity is the goal Familiar Clements 6.4 is base global taxonomy Follows recognized regional authorities for taxonomic and nomenclatural decisions Standardized English and Scientific Names for all taxa Translations in other languages http://ebird.org/content/ebird/about/ebird- taxonomy for download Personal support for taxonomic questions

12. The eBird Taxonomy (v1.05) User familiarity is the goal Familiar Clements 6.4 is base global taxonomy Follows recognized regional authorities for taxonomic and nomenclatural decisions Standardized English and Scientific Names for all taxa Translations in other languages http://ebird.org/content/ebird/about/ebird- taxonomy for download Personal support for taxonomic questions

13. The eBird Taxonomy (v1.05) User familiarity is the goal Familiar Clements 6.4 is base global taxonomy Follows recognized regional authorities for taxonomic and nomenclatural decisions Standardized English and Scientific Names for all taxa Translations in other languages http://ebird.org/content/ebird/about/ebird- taxonomy for downloadhttp://ebird.org/content/ebird/about/ebird- taxonomy Personal support for taxonomic questions

14. The eBird Taxonomy (v1.05) User familiarity is the goal Familiar Clements 6.4 is base global taxonomy Follows recognized regional authorities for taxonomic and nomenclatural decisions Standardized English and Scientific Names for all taxa Translations in other languages http://ebird.org/content/ebird/about/ebird- taxonomy for download Personal support for taxonomic questions

18. The eBird Taxonomy Taxa: 11,920 eBird 1.05

19. The eBird Taxonomy Taxa: 11,920 10,005 Species: e.g., Ivory Gull eBird 1.05

20. The eBird Taxonomy Taxa: 11,920 10,005 Species: eBird 1.05 Ssp. groups: e.g., “Western” Willet 1333

21. The eBird Taxonomy Taxa: 11,920 10,005 Species: eBird 1.05 Ssp. groups: Spuhs: e.g., Empidonax sp. 1333 435

22. The eBird Taxonomy Taxa: 11,920 10,005 Species: eBird 1.05 Ssp. groups: Spuhs: Hybrids: e.g., Snowy Egret x Tricolored Heron 1333 435 113

23. The eBird Taxonomy Taxa: 11,920 10,005 Species: eBird 1.05 Ssp. groups: Spuhs: Hybrids: 1333 435 113 Others: e.g., “Domestic” Mallard, undescribed species 34

26. eBird Data Quality: Crowdsourcing 1100 automated filters check every submission Flagged records require validation ~300 experts vet all flagged records and request voucher material when needed ~1,000,000 record reviewed annually; 67% accepted

27. eBird Data Quality: Crowdsourcing 1100 automated filters check every submission Flagged records require validation ~300 experts vet all flagged records and request voucher material when needed ~1,000,000 record reviewed annually; 67% accepted

28. eBird Data Quality: Crowdsourcing 1100 automated filters check every submission Flagged records require validation ~300 experts vet all flagged records and request voucher material when needed ~1,000,000 record reviewed annually; 67% accepted

29. eBird Data Quality: Crowdsourcing 1100 automated filters check every submission Flagged records require validation ~300 experts vet all flagged records and request voucher material when needed ~1,000,000 record reviewed annually; 67% accepted

35. Indigo Bunting | Full Year

36. Chimney Swift | Full Year

37. Indigo Bunting | Breeding St. Louis Chicago Atlanta Detroit

38. Chimney Swift | Breeding Chicago Atlanta Dallas Houston

40. and beyond…