City Nature Challenge Tallies Over 1.87 Million Wildlife Observations

Over 66,000 community scientists from 482 cities around the world document more than 2,570 rare, endangered, or threatened species in a four-day community science effort

Los Angeles, CA (May 8, 2023) — The City Nature Challenge (CNC) results are in! More than 66,000 people across 46 countries and six continents documented more than 1.87 million wildlife observations for the 8th annual community science initiative. More than 57,227 species were observed, with the Mallard Duck coming in as the most popular around the world and the Western Fence lizard as the most common in Los Angeles County.
The global event called on current and aspiring community scientists, nature and science fans, and people of all ages and backgrounds to observe and submit pictures of wild plants, animals, and fungi from April 28 to May 1. Participants submitted pictures of wild plants and animals using the free mobile app, iNaturalist. The competition underscores the power of community science to track real-time changes in our planet’s biodiversity.

After co-founding and organizing the first-ever City Nature Challenge in 2016 as a competition between the Los Angeles and San Francisco metro areas, the Natural History Museum of Los Angeles County (NHM) and the California Academy of Sciences expanded the initiative to 482 cities this year. This year’s 1.87 million observations included sightings of more than 2,570 rare, endangered, or threatened species. The Challenge engaged more than 66,000 observers around the world, including 1,671 in Los Angeles County alone.

Local support for the City Nature Challenge was generously provided by Boeing and the Los Angeles Department of Water and Power.

Los Angeles County by the Numbers

  • Observations: 25,542
  • Species: 2,646 (including 72 rare/endangered/threatened species)
  • Observers: 1,671 
    • 485 people created their iNaturalist account since the beginning of April and collectively made 3,190 observations and recorded 294 species
    • Average number of observations per person: 15.29

Los Angeles County Highlights

World by the numbers

  • Observations: 1,870,763
  • Species: 57,227+ (including more than 2,570 rare/endangered/threatened species)
  • Observers: 66,394
  • Most-observed species globally: Mallard duck (Anas platyrhynchos)
  • Cities: 482
  • Countries: 46

World highlights
Highlights from around the U.S. and the world include an inquisitive yellow-crowned night heron in Texas, a giant electric ray with albinism near Mexico’s Socorro Island, an Indo-Pacific humpback dolphin off the coast Hong Kong, a pair of red fox pups in England, a short-tailed weasel after a successful hunt in Utah, Asian weaver ants dismembering a queen from a rival colony in Thailand, a carefree southern sea otter in California’s Monterey Bay, a pointy, peach-colored sea slug in New Zealand, a coast patchnose snake in Orange County, a critically endangered buchu plant in South Africa, and a Pacific horned frog in Ecuador.

The current landscape of urban biodiversity is poorly understood. As global human populations grow increasingly concentrated in cities, documenting urban biodiversity—and our impact on it—is a crucial part of understanding our shared future. Large pools of data, including those built by iNaturalist and natural history museums, aid in scientific research and help land managers make informed conservation decisions for humans to sustainably coexist with regional plant and animal life.

In 2022, the Challenge tallied more than 1.69 million observations, including over 2,244 rare, endangered, or threatened species; engaged more than 67,000 observers; and recorded over 50,100 species worldwide.

Urban nature initiatives at the Natural History Museum of Los Angeles County (NHM)
In the last several years, NHM has shifted its attention to include not just natural and cultural history, but living nature—specifically, the nature of L.A. With the 2013 addition of the outdoor Nature Gardens and their companion indoor exhibit, the Nature Lab, the museum has onsite venues that engage Angelenos in an investigation of the nature around them. Additionally, the Museum’s Urban Nature Research Center(UNRC) and Community Science Program help spotlight ways to boost and sustain Los Angeles’ biodiversity. UNRC and Community Science Program initiatives include the City Nature Challenge, cofounded with the California Academy of Science; SuperProject, the world's largest urban biodiversity survey; RASCals (Reptiles and Amphibians of Southern California); SLIME (Snails and Slugs Livings in Metropolitan Environments); BioSCAN (Biodiversity Science: City and Nature); Southern California Squirrel Survey; L.A. Spider Survey; and more. Visit NHM.ORG/nature for more information.

About the Natural History Museums of Los Angeles County (NHMLAC)
The Natural History Museums of Los Angeles County (NHMLAC) include the Natural History Museum in Exposition Park, La Brea Tar Pits in Hancock Park, and the William S. Hart Museum in Newhall. They operate under the collective vision to inspire wonder, discovery, and responsibility for our natural and cultural worlds. The museums hold one of the world’s most extensive and valuable collections of natural and cultural history—more than 35 million objects. Using these collections for groundbreaking scientific and historical research, the museums also incorporate them into on- and offsite nature and culture exploration in L.A. neighborhoods, and a slate of community science programs—creating indoor-outdoor visitor experiences that explore the past, present, and future. Visit NHMLAC.ORG for adventure, education, and entertainment opportunities.

About the California Academy of Sciences
The California Academy of Sciences is a renowned scientific and educational institution with a mission to regenerate the natural world through science, learning, and collaboration. Based in San Francisco’s Golden Gate Park, it is home to a world-class aquarium, planetarium, and natural history museum, as well as innovative programs in scientific research and environmental education—all under one living roof. Museum hours are 9:30 am–5pm Monday through Saturday, and 11 am–5 pm on Sunday. Admission includes all exhibits, programs, and shows. For daily ticket prices, please visit or call (415) 379-8000 for more information.

Media Contact
Amy Hood

Josh Chesler