Type of site
|Available in||37 languages|
|Owner||California Academy of Sciences and the National Geographic Society|
|Users||1.8 million registered users (December 2020) [update] |
iNaturalist is a social network of naturalists, citizen scientists, and biologists built on the concept of mapping and sharing observations of biodiversity across the globe.   iNaturalist may be accessed via its website or from its mobile applications.   As of February 2021 [update], iNaturalist users had contributed approximately 66 million observations of plants, animals, fungi, and other organisms worldwide, and around 130,000 users were active in the previous 30 days. 
iNaturalist describes itself as "an online social network of people sharing biodiversity information to help each other learn about nature", with its primary goal being to connect people to nature.  Although it is not a science project itself, iNaturalist is a platform for science and conservation efforts, providing valuable open data to research projects, land managers, other organizations, and the public.   It is the primary application for crowd-sourced biodiversity data in places such as Mexico, southern Africa, and Australia,    and the project has been called "a standard-bearer for natural history mobile applications." 
iNaturalist began in 2008 as a UC Berkeley School of Information Master's final project of Nate Agrin, Jessica Kline, and Ken-ichi Ueda.  Nate Agrin and Ken-ichi Ueda continued work on the site with Sean McGregor, a web developer. In 2011, Ueda began collaboration with Scott Loarie, a research fellow at Stanford University and lecturer at UC Berkeley. Ueda and Loarie are the current co-directors of iNaturalist.org.  The organization merged with the California Academy of Sciences on April 24, 2014.  In 2017, iNaturalist became a joint initiative between the California Academy of Sciences and the National Geographic Society. 
Since 2012, the number of participants and observations has roughly doubled each year.  In 2014, iNaturalist reached 1 million observations  and as of February 2021 there were 66 million observations. 
Users can interact with iNaturalist in several ways:
- through the iNaturalist.org website,
- through two mobile apps: iNaturalist (iOS/Android)   and Seek (iOS/Android),   or
- through partner organizations such as the Global Biodiversity Information Facility (GBIF) website. 
On the iNaturalist.org website, visitors can search the public dataset and interact with other people adding observations and identifications. The website provides tools for registered users to add, identify, and discuss observations, write journal posts, explore information about species, and create project pages to recruit participation in and coordinate work on their topics of interest.   
Seek by iNaturalist, a separate app designed for children and families, requires no online account registration and all observations may remain private.  Seek incorporates features of gamification, such as providing a list of nearby organisms to find and encouraging the collection of badges and participation in challenges.  Seek was initially released in the spring of 2018. 
The iNaturalist platform is based on crowdsourcing of observations and identifications. An iNaturalist observation records a person's encounter with an individual organism at a particular time and place.  An iNaturalist observation may also record evidence of an organism, such as animal tracks, nests, or scat. The scope of iNaturalist excludes natural but inert subjects such as geologic or hydrologic features. Users typically upload photos as evidence of their findings, though audio recordings are also accepted and such evidence is not a strict requirement. Users may share observation locations publicly, "obscure" them to display a less precise location, or make the locations completely private.
On iNaturalist, other users add identifications to each other's observations in order to confirm or improve the identification of the observation. Observations are classified as "Casual," "Needs ID" (needs identification), or "Research Grade" based on the quality of the data provided and the community identification process. Any quality of data can be downloaded from iNaturalist and "Research Grade" observations are often incorporated into other online databases such as the Global Biodiversity Information Facility and the Atlas of Living Australia.  
In addition to observations being identified by others in the community, iNaturalist includes an automated species identification tool, first released in 2017.  Images can be identified via a computer vision model which has been trained on the large database of the observations on iNaturalist.  If the image is of a little-observed species, one hard to identify from images alone, or it has poor lighting, is blurry, or contains multiple subjects, it can be difficult for the model to determine the species and it may decide incorrectly. Multiple species suggestions are typically provided with the suggestion that the software guesses to be most likely is at the top of the list. A broader taxon such as a genus or family is commonly provided if the model cannot decide what the species is. The model is trained once or twice a year and the threshold for species included in the training set has changed over time. 
Users have created and contributed to tens of thousands of different projects on iNaturalist.   The platform is commonly used to record observations during bioblitzes, which are biological surveying events that attempt to record all the species that occur within a designated area, and a specific project type on iNaturalist.    Other project types include collections of observations by location or taxon, or documenting specific types of observations such as animal tracks and signs,  the spread of invasive species, roadkill,  fishing catches, or discovering new species.  In 2011, iNaturalist was used as a platform to power the Global Amphibian and Global Reptile BioBlitzes, in which observations were used to help monitor the occurrence and distribution of the world's reptiles and amphibian species.  The US National Park Service partnered with iNaturalist to record observations from the 2016 National Parks BioBlitz. That project exceeded 100,000 observations in August 2016.  In 2017, the United Nations Environment Programme teamed up with iNaturalist to celebrate World Environment Day. 
In 2016, Lila Higgins from the Natural History Museum of Los Angeles County and Alison Young from the California Academy of Sciences co-founded the City Nature Challenge (CNC). In the first City Nature Challenge, naturalists in Los Angeles and the San Francisco Bay Area documented over 20,000 observations with the iNaturalist platform.  In 2017, the CNC expanded to 16 cities across the United States and collected over 125,000 observations of wildlife in 5 days.  The CNC expanded to a global audience in 2018, with 68 cities participating from 19 countries, with some cities using community science platforms other than iNaturalist to participate.  In 4 days, over 17,000 people cataloged over 440,000 nature observations in urban regions around the world.  In 2019, the CNC once again expanded, with 35,000 participants in 159 cities collecting 964,000 observations of over 31,000 species.  Although fewer observations were documented during the 2020 City Nature Challenge during the COVID-19 pandemic (when the CNC became collaborative as opposed to competitive), more cities and people participated and more species were found than in previous years. 
Users have the option to license their observations, photos, and audio recordings in several ways, including for the public domain, Creative Commons, or with all rights reserved. To encourage the sharing of information and to reduce costs, iNaturalist encourages users to license media with Creative Commons licenses.  The default license is CC BY-NC,  meaning others are free to copy, redistribute, remix, transform, and build upon the media as long as appropriate credit is given, changes are indicated, a link to the license is provided, and it is not used for commercial purposes. 
Observations and media licensed with Creative Commons licenses are often shared elsewhere, including the Global Biodiversity Information Facility (excluding share-alike and no derivatives licenses),  Atlas of Living Australia,  and Wikipedia (excluding noncommercial and no derivatives licenses)  through regular imports   or user scripts such as iNaturalist2Commons  and Wiki Loves iNaturalist. 
Semi-log plot of annual changes in number of species observed (in thousands; green) and number of 'verifiable' (i.e. no penalties in data quality assessment) observations (in millions; black).
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|Wikimedia Commons has media related to INaturalist.|