Observation.org (English Wikipedia)

"Observation.org home page". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.
"Stats". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.
"Stats". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.
"Waarnemingen.be statistieken". January 14, 2026. Archived from the original on January 14, 2026. Retrieved January 14, 2026.
"Biodiversity Challenge for ICA Members 2025". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.
"Biodiversity Challenge at European Life Science Universities 2025". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.

bayern.de (Global: 673^rd place; English: 1,681^st place)

anl.bayern.de

"Biodiversitätsdaten, Citizen Science und Online-Erfassungssysteme" (PDF). ANLiegen Natur (in German). 43. Retrieved December 25, 2023.

bnnvara.nl (Global: low place; English: low place)

"50 miljoen waarnemingen op Waarneming.nl - Vroege Vogels - BNNVARA". Vroege Vogels (in Dutch). October 8, 2017. Retrieved December 29, 2023.

cbs.nl (Global: 747^th place; English: 1,404^th place)

"Libellenstatistiek". cbs.nl (in Dutch). Retrieved December 27, 2023.

ceh.ac.uk (Global: low place; English: low place)

Brown, Peter (2023). "Using Citizen Science with alien Species" (PDF). UK Centre for Ecology & Hydrology. Retrieved December 28, 2023.

citynaturechallenge.at (Global: low place; English: low place)

"City Nature Challenges in Österreich". citynaturechallenge.at (in German). Retrieved December 26, 2023.

dcnanature.org (Global: low place; English: low place)

"Observation.org". dcnanature.org. Retrieved December 25, 2023.

doi.org (Global: 2^nd place; English: 2^nd place)

Van Eupen, Camille; Maes, Dirk; Herremans, Marc; Swinnen, Kristijn R.R.; Somers, Ben; Luca, Stijn (March 15, 2021). "The impact of data quality filtering of opportunistic citizen science data on species distribution model performance". Ecological Modelling. 444. Bibcode:2021EcMod.44409453V. doi:10.1016/j.ecolmodel.2021.109453. hdl:1854/LU-8693490.
Herremans, Marc; Gielen, Karin; Van Kerckhoven, Jos; Vanormelingen, Pieter; Veraghtert, Wim; Swinnen, Kristijn R.R.; Maes, Dirk (July 29, 2021). "Abundant Citizen Science Data Reveal That the Peacock Butterfly Aglais io Recently Became Bivoltine in Belgium". Insects. 12 (8): 683. doi:10.3390/insects12080683. PMC 8396639. PMID 34442249.
Johnson, Brian Alan; Mader, André Derek; Dasgupta, Rajarshi; Kumar, Pankaj (March 2020). "Citizen science and invasive alien species: An analysis of citizen science initiatives using information and communications technology (ICT) to collect invasive alien species observations". Global Ecology and Conservation. 21 e00812. Bibcode:2020GEcoC..2100812J. doi:10.1016/j.gecco.2019.e00812.
Sevgili, Hasan; Yilmaz, Kaan (2022). "Contributions of citizen scientists to monitoring alien species: the case study on Giant Asian Mantes, Hierodula tenuidentata and H. patellifera (Mantodea: Mantidae)". Zoology in the Middle East. 68 (4): 350–358. doi:10.1080/09397140.2022.2145802. S2CID 254638249.
Gil-Tapetado, Diego; et al. (2023). "Aridity could have driven the local extinction of a common and multivoltine butterfly" (PDF). Ecological Entomology. 48 (1): 40–54. Bibcode:2023EcoEn..48...40G. doi:10.1111/een.13200. Retrieved December 26, 2023.
Saavedra, Irene; Rabadán-González, Julio; Aragonés, David; Figuerola, Jordi (September 21, 2023). "Can Citizen Science Contribute to Avian Influenza Surveillance?". Pathogens. 12 (9): 1183. doi:10.3390/pathogens12091183. PMC 10535995. PMID 37764991.
Boeken, Michiel (2019). "New avifaunal records and checklist for the island of Saba, Caribbean Netherlands". Journal of Caribbean Ornithology. 31: 57–64. doi:10.55431/jco.2018.31.57-64.
Schermer, Maarten; Hogeweg, Laurens (May 17, 2018). Supporting citizen scientists with automatic species identification using deep learning image recognition models (PDF). Biodiversity Information Science and Standards 2. Biodiversity Information and Standards. doi:10.3897/biss.2.25268. S2CID 56315355.
Hogeweg, Laurens; Schermer, Maarten. Machine Learning Model for Identifying Dutch/ Belgian Biodiversity (PDF). Biodiversity Information Science and Standards 3. Biodiversity Information and Standards. doi:10.3897/biss.3.39229.

eis-nederland.nl (Global: low place; English: low place)

"De opmars van de Aziatische hoornaar (Vespa velutina) naar Nederland" (PDF). Entomologische Berichten (in Dutch). 78. 2018.

eurobirdportal.org (Global: low place; English: low place)

"EuroBirdPortal -- Partners". eurobirdportal.org. Retrieved December 25, 2023.

fao.org (Global: 318^th place; English: 411^th place)

agris.fao.org

"Contribution of Observation.org to Ebba2 (Second European Breeding Bird Atlas)". agris.fao.org. Retrieved December 27, 2023.

gbif.org (Global: 1,611^th place; English: 1,593^rd place)

"Observation.org". gbif.org. Retrieved December 24, 2023.
"Search occurrences -- Observation.org Image". gbif.org. Retrieved December 25, 2023.
"Search occurrences -- Observation.org Audio". gbif.org. Retrieved December 25, 2023.
"Search datasets". gbif.org. Retrieved December 24, 2023.
"Resources search -- Observation.org". gbif.org.

handle.net (Global: 102^nd place; English: 76^th place)

hdl.handle.net

Van Eupen, Camille; Maes, Dirk; Herremans, Marc; Swinnen, Kristijn R.R.; Somers, Ben; Luca, Stijn (March 15, 2021). "The impact of data quality filtering of opportunistic citizen science data on species distribution model performance". Ecological Modelling. 444. Bibcode:2021EcMod.44409453V. doi:10.1016/j.ecolmodel.2021.109453. hdl:1854/LU-8693490.

harvard.edu (Global: 18^th place; English: 17^th place)

ui.adsabs.harvard.edu

Van Eupen, Camille; Maes, Dirk; Herremans, Marc; Swinnen, Kristijn R.R.; Somers, Ben; Luca, Stijn (March 15, 2021). "The impact of data quality filtering of opportunistic citizen science data on species distribution model performance". Ecological Modelling. 444. Bibcode:2021EcMod.44409453V. doi:10.1016/j.ecolmodel.2021.109453. hdl:1854/LU-8693490.
Johnson, Brian Alan; Mader, André Derek; Dasgupta, Rajarshi; Kumar, Pankaj (March 2020). "Citizen science and invasive alien species: An analysis of citizen science initiatives using information and communications technology (ICT) to collect invasive alien species observations". Global Ecology and Conservation. 21 e00812. Bibcode:2020GEcoC..2100812J. doi:10.1016/j.gecco.2019.e00812.
Gil-Tapetado, Diego; et al. (2023). "Aridity could have driven the local extinction of a common and multivoltine butterfly" (PDF). Ecological Entomology. 48 (1): 40–54. Bibcode:2023EcoEn..48...40G. doi:10.1111/een.13200. Retrieved December 26, 2023.

hetnatuurhistorisch.nl (Global: low place; English: low place)

"Twee nieuwe sprinkhanen in 2022: grote spitskop en spoorkrekel" (PDF). hetnatuurhistorisch.nl (in Dutch). Retrieved December 25, 2023.

ica-europe.info (Global: low place; English: low place)

"Biodiversity Challenge for ICA Members 2025". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.

miteco.gob.es (Global: low place; English: low place)

"Biomaratón de otoño 2022". miteco.gob.es (in Spanish). Retrieved December 26, 2023.

natagora.be (Global: low place; English: low place)

""OBSERVATIONS.BE", UN PORTAIL D'ENCODAGE POUR TOUS". natagora.be (in French). Retrieved December 25, 2023.

naturespot.org.uk (Global: low place; English: low place)

"Apps for Identification". www.naturespot.org.uk. Retrieved December 28, 2023.

naturetoday.com (Global: low place; English: low place)

Vanreusel, Wouter (December 3, 2012). "Waarnemingen.be rondt de kaap van 10 miljoen". www.naturetoday.com (in Dutch). Retrieved December 29, 2023.

natuurpunt.be (Global: low place; English: low place)

"Hittegolf bracht Afrikaanse oranje zonnewijzer naar België". natuurpunt.be (in Dutch). Retrieved December 25, 2023.
"Spoorkrekel duikt voor het eerst op in België". natuurpunt.be (in Dutch). Retrieved December 25, 2023.
"Natuurpunt Studie -- Waarnemingen.be". natuurpunt.be (in Dutch). Retrieved December 25, 2023.

natuurtijdschriften.nl (Global: low place; English: low place)

"Eerste vondst van de Aziatische hoornaar Vespa velutina nigrithorax in Nederland (Hymenoptera: Vespidae)". Nederlandse Faunistische Mededelingen (in Dutch). 49: 1–10. 2017.

nhsn.org.uk (Global: low place; English: low place)

Coleman, Ellie (November 29, 2023). "Helpful Apps for Identifying Wildlife". Natural History Society of Northumbria. Retrieved December 28, 2023.

nih.gov (Global: 4^th place; English: 4^th place)

ncbi.nlm.nih.gov

Herremans, Marc; Gielen, Karin; Van Kerckhoven, Jos; Vanormelingen, Pieter; Veraghtert, Wim; Swinnen, Kristijn R.R.; Maes, Dirk (July 29, 2021). "Abundant Citizen Science Data Reveal That the Peacock Butterfly Aglais io Recently Became Bivoltine in Belgium". Insects. 12 (8): 683. doi:10.3390/insects12080683. PMC 8396639. PMID 34442249.
Saavedra, Irene; Rabadán-González, Julio; Aragonés, David; Figuerola, Jordi (September 21, 2023). "Can Citizen Science Contribute to Avian Influenza Surveillance?". Pathogens. 12 (9): 1183. doi:10.3390/pathogens12091183. PMC 10535995. PMID 37764991.

pubmed.ncbi.nlm.nih.gov

Herremans, Marc; Gielen, Karin; Van Kerckhoven, Jos; Vanormelingen, Pieter; Veraghtert, Wim; Swinnen, Kristijn R.R.; Maes, Dirk (July 29, 2021). "Abundant Citizen Science Data Reveal That the Peacock Butterfly Aglais io Recently Became Bivoltine in Belgium". Insects. 12 (8): 683. doi:10.3390/insects12080683. PMC 8396639. PMID 34442249.
Saavedra, Irene; Rabadán-González, Julio; Aragonés, David; Figuerola, Jordi (September 21, 2023). "Can Citizen Science Contribute to Avian Influenza Surveillance?". Pathogens. 12 (9): 1183. doi:10.3390/pathogens12091183. PMC 10535995. PMID 37764991.

observation.org (Global: low place; English: low place)

"Observation.org home page". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.
"Stats". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.
"Validation". Observation.org. Retrieved December 24, 2023.

overmeersevogels.com (Global: low place; English: low place)

"Interview with Hisko de Vries". overmeersevogels.com (in Dutch). Retrieved December 25, 2023.

pubhtml5.com (Global: low place; English: low place)

Jones, Josh (August 2020). "The ideal companion - ObsIdentify app for IOS and Android". Pubhtml5. p. 49. Retrieved December 29, 2023.

researchgate.net (Global: 120^th place; English: 125^th place)

Dufour, Paul; et al. "Are Red-rumped Swallows starting to winter in the Western Palearctic?". Dutch Birding. 42: 111–113.

rki.de (Global: 4,845^th place; English: low place)

"Project ZEMEKI: Tick and mosquito identification using artificial intelligence". Robert Koch Institute. July 25, 2025. Retrieved August 20, 2025.

sciencedirect.com (Global: 149^th place; English: 178^th place)

Van Eupen, Camille; Maes, Dirk; Herremans, Marc; Swinnen, Kristijn R.R.; Somers, Ben; Luca, Stijn (March 15, 2021). "The impact of data quality filtering of opportunistic citizen science data on species distribution model performance". Ecological Modelling. 444. Bibcode:2021EcMod.44409453V. doi:10.1016/j.ecolmodel.2021.109453. hdl:1854/LU-8693490.

semanticscholar.org (Global: 11^th place; English: 8^th place)

api.semanticscholar.org

Sevgili, Hasan; Yilmaz, Kaan (2022). "Contributions of citizen scientists to monitoring alien species: the case study on Giant Asian Mantes, Hierodula tenuidentata and H. patellifera (Mantodea: Mantidae)". Zoology in the Middle East. 68 (4): 350–358. doi:10.1080/09397140.2022.2145802. S2CID 254638249.
Schermer, Maarten; Hogeweg, Laurens (May 17, 2018). Supporting citizen scientists with automatic species identification using deep learning image recognition models (PDF). Biodiversity Information Science and Standards 2. Biodiversity Information and Standards. doi:10.3897/biss.2.25268. S2CID 56315355.

pdfs.semanticscholar.org

Schermer, Maarten; Hogeweg, Laurens (May 17, 2018). Supporting citizen scientists with automatic species identification using deep learning image recognition models (PDF). Biodiversity Information Science and Standards 2. Biodiversity Information and Standards. doi:10.3897/biss.2.25268. S2CID 56315355.

sussexwildlifetrust.org.uk (Global: low place; English: low place)

"The good, the bad and the middling - ID apps". Sussex Wildlife Trust. August 14, 2023. Retrieved December 28, 2023.

ucm.es (Global: 1,613^th place; English: 3,265^th place)

eprints.ucm.es

Gil-Tapetado, Diego; et al. (2023). "Aridity could have driven the local extinction of a common and multivoltine butterfly" (PDF). Ecological Entomology. 48 (1): 40–54. Bibcode:2023EcoEn..48...40G. doi:10.1111/een.13200. Retrieved December 26, 2023.

vrt.be (Global: 1,864^th place; English: 4,369^th place)

van den Buijs, Dennis (March 26, 2020). "Natuurpunt verbergt waarnemingen zeldzame vogels:"Samenscholing spotters vermijden"". vrtnws.be (in Dutch). Retrieved December 29, 2023.

waarneming.nl (Global: low place; English: low place)

"Stats". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.

waarnemingen.be (Global: low place; English: low place)

"Waarnemingen.be statistieken". January 14, 2026. Archived from the original on January 14, 2026. Retrieved January 14, 2026.
"Biodiversity Challenge at European Life Science Universities 2025". January 13, 2026. Archived from the original on January 13, 2026. Retrieved January 13, 2026.

zenodo.org (Global: 621^st place; English: 380^th place)

Hogeweg, Laurens; Schermer, Maarten. Machine Learning Model for Identifying Dutch/ Belgian Biodiversity (PDF). Biodiversity Information Science and Standards 3. Biodiversity Information and Standards. doi:10.3897/biss.3.39229.

zobodat.at (Global: 4,125^th place; English: 9,546^th place)

Kaufmann, Peter; et al. "Der Bioblitz Salzburg 2021 auf Observation.org – eine Citizen Science Bestandserfassung der urbanen Biodiversität Salzburgs" (PDF). Mitteilungen aus dem Haus der Natur Salzburg (in German). 28: 5–20. Retrieved December 26, 2023.

Observation.org (English Wikipedia)

archive.today (Global: 14th place; English: 14th place)

bayern.de (Global: 673rd place; English: 1,681st place)

anl.bayern.de

bnnvara.nl (Global: low place; English: low place)

cbs.nl (Global: 747th place; English: 1,404th place)

ceh.ac.uk (Global: low place; English: low place)

citynaturechallenge.at (Global: low place; English: low place)

dcnanature.org (Global: low place; English: low place)

doi.org (Global: 2nd place; English: 2nd place)

eis-nederland.nl (Global: low place; English: low place)

eurobirdportal.org (Global: low place; English: low place)

fao.org (Global: 318th place; English: 411th place)

agris.fao.org

gbif.org (Global: 1,611th place; English: 1,593rd place)

handle.net (Global: 102nd place; English: 76th place)

hdl.handle.net

harvard.edu (Global: 18th place; English: 17th place)

ui.adsabs.harvard.edu

hetnatuurhistorisch.nl (Global: low place; English: low place)

ica-europe.info (Global: low place; English: low place)

miteco.gob.es (Global: low place; English: low place)

natagora.be (Global: low place; English: low place)

naturespot.org.uk (Global: low place; English: low place)

naturetoday.com (Global: low place; English: low place)

natuurpunt.be (Global: low place; English: low place)

natuurtijdschriften.nl (Global: low place; English: low place)

nhsn.org.uk (Global: low place; English: low place)

nih.gov (Global: 4th place; English: 4th place)

ncbi.nlm.nih.gov

pubmed.ncbi.nlm.nih.gov

observation.org (Global: low place; English: low place)

overmeersevogels.com (Global: low place; English: low place)

pubhtml5.com (Global: low place; English: low place)

researchgate.net (Global: 120th place; English: 125th place)

rki.de (Global: 4,845th place; English: low place)

sciencedirect.com (Global: 149th place; English: 178th place)

semanticscholar.org (Global: 11th place; English: 8th place)

api.semanticscholar.org

pdfs.semanticscholar.org

sussexwildlifetrust.org.uk (Global: low place; English: low place)

ucm.es (Global: 1,613th place; English: 3,265th place)

eprints.ucm.es

vrt.be (Global: 1,864th place; English: 4,369th place)

waarneming.nl (Global: low place; English: low place)

waarnemingen.be (Global: low place; English: low place)

zenodo.org (Global: 621st place; English: 380th place)

zobodat.at (Global: 4,125th place; English: 9,546th place)

archive.today (Global: 14^th place; English: 14^th place)

bayern.de (Global: 673^rd place; English: 1,681^st place)

cbs.nl (Global: 747^th place; English: 1,404^th place)

doi.org (Global: 2^nd place; English: 2^nd place)

fao.org (Global: 318^th place; English: 411^th place)

gbif.org (Global: 1,611^th place; English: 1,593^rd place)

handle.net (Global: 102^nd place; English: 76^th place)

harvard.edu (Global: 18^th place; English: 17^th place)

nih.gov (Global: 4^th place; English: 4^th place)

researchgate.net (Global: 120^th place; English: 125^th place)

rki.de (Global: 4,845^th place; English: low place)

sciencedirect.com (Global: 149^th place; English: 178^th place)

semanticscholar.org (Global: 11^th place; English: 8^th place)

ucm.es (Global: 1,613^th place; English: 3,265^th place)

vrt.be (Global: 1,864^th place; English: 4,369^th place)

zenodo.org (Global: 621^st place; English: 380^th place)

zobodat.at (Global: 4,125^th place; English: 9,546^th place)