The City Nature Challenge: A win for science and nature

All of our certified California Naturalists know how to use iNaturalist. Since uploading at least one observation is part of the course requirements, the City Nature Challenge was the perfect opportunity for Naturalists to reconnect with each other, offer their skills to their city's efforts, and contribute to a global scientific database.

The 4th annual City Nature Challenge was a huge success around the world. Together with the 159 cities that participated, we uploaded almost one million observations of biodiversity to iNaturalist in just 4 days. More than 35,000 people took part across the globe, and over 31,000 species were documented, including more than 1,100 rare, endangered, or threatened species.

This was also the biggest week for observations recorded in iNaturalist history, as demonstrated in the graph below.

With the San Francisco Bay Area, Los Angeles County, and San Diego County organizers publicizing the Challenge for their cities and working to highlight events, we wanted a chance for our Sacramento Region Naturalists to join the fun, too. Beginning in September of 2018, we co-organized for the Sacramento Region with Ryan Meyer and Julianna Yee from the UC Davis School of Education's Center for Community and Citizen Science, our UC Davis Evolution and Ecology California Naturalist instructor Laci Gerhart-Barley, and environmental educator Chelle Temple-King.

The California Naturalist program wants to recognize the contributions of our Naturalists to their city's final counts. We know many of you were out there at bioblitzes or in your backyards taking photos all weekend, and celebrate all that you contributed to science and nature. Congratulations on your achievements both large and small! We want to take a moment to highlight a few of our certified Naturalists, instructors, and partners for their involvement this year:

• Partners that held Bioblitzes outside of city boundaries over the weekend: UC Hopland Research & Extension Center, UC Santa Cruz Arboretum
• Sacramento Region CalNat partners: Many thanks to American River Conservancy, Yolo Basin Foundation, Effie Yeaw Nature Center, and UC Davis' Wild Davis for organizing Bioblitzes as first year guinea pigs
• Bay Area CalNat partners: thanks to Sonoma Ecology Center for a Bioblitz and Grassroots Ecology for contributing observations during their class field trip
• Certified California Naturalist Cedric Lee as the number one observer for Los Angeles County!
• Certified California Naturalist and Tuleyome instructor Mary Hanson came in 5^th for the Sacramento Region; UC Davis' Wild Davis instructor Laci Gerhart-Barley and 3 current CalNat students came in the top 10
• Certified California Naturalist Millie Basden came in 8^th for San Diego County
• Certified California Naturalist Amy Jaecker-Jones is a co-organizer for the international City Nature Challenge through the Natural History Museum of Los Angeles County

Despite the final results, the real winner of the City Nature Challenge is science and nature. A database holding a greater number of research-grade observations to draw from allows scientists to further study our natural world. You can take a look at publications that have used data from iNaturalist to see just where our contributions are going. And of course, the more people who get outside during the Challenge, the more people engage with the nature around them. Everybody wins!

Naturalists, if you participated in uploading observations to iNaturalist during the City Nature Challenge weekend, remember to record your hours in our Volunteer Management System!

Highlights of San Francisco Bay Area City Nature Challenge 2019:  1st place for number of observers with 1,947 (This includes more than 550 observers who were new to iNaturalist!) 1st place for number of identifiers with 813 4th place for number of observations with 38,028 5th place for number of species found at 3,183	Douglas Iris from Bay Area Certified California Naturalist Bruce Hartsough
Highlights of Los Angeles County City Nature Challenge 2019:  Los Angeles had the greatest increase in number of observations over last year: increase of 14,702 observations! Los Angeles had the greatest increase in number of people observing over last year: increase of 700 people! Over 1/3 of our observers were new to iNaturalist in the two weeks before CNC began	California Sister from Los Angeles area Certified California Naturalist Kim Moore
Highlights of San Diego County City Nature Challenge 2019:  Came in the top 10 against 159 cities/counties around the world Placed 3rd in the world for number of observations Placed 1st in all three categories against those with similar arid climates	Fungi from San Diego Certified California Naturalist Paige Decino
Highlights of Sacramento Region City Nature Challenge 2019: Overall, Sacramento came in 30th out of 159 participating cities Of 27 the other participating cities with a population of 2,500,000-5,000,000, Sacramento came in 9th Sacramento came in 5th for the number of total observers for a region > 20,000 km2 In all of 2019 leading up to the Challenge, post-Challenge our region was able to increase the number of observations by 7.8% (9832 observations), species by 2% (124 species), and observers by 3.5% (233 observers). For all the observations we collected in the Sacramento region, 57% ID'd to species became research grade (or useable for scientific quality data).	Western Kingbird from California Naturalist Academic Coordinator Greg Ira