Explore Urban Biodiversity: Join the 2025 City Nature Challenge

The City Nature Challenge invites people worldwide to document urban biodiversity by photographing and sharing wild plants and animals through the iNaturalist app, helping scientists track and understand real-time changes in ecosystems.

2 minute read

November 24, 2024, 9:00 AM PST

By Clement Lau


Hawk perched on tree in city park.

Corey / Adobe Stock

The City Nature Challenge is a global event happening from April 25 to April 28, 2025, inviting individuals of all ages and backgrounds to explore and document the wild plants, animals, and fungi in their surroundings. This initiative aims to engage community scientists, nature enthusiasts, and everyday observers to contribute to tracking real-time biodiversity changes. By sharing photographs of wildlife, participants help scientists better understand the planet’s ecosystems and advance wildlife conservation efforts.

Participation is simple and starts at home. Observers can explore their homes, backyards, or neighborhoods to find wild plants, insects, or animals—whether it is a bird on a powerline, a weed sprouting in the yard, or an insect scurrying under leaves. Local parks also provide excellent opportunities to discover different species by checking grass, plants, benches, and trees. Safety is paramount, so participants are encouraged to be mindful of their surroundings when exploring and documenting wildlife.

To join, download the iNaturalist app and follow four easy steps: locate wildlife in your area, take photos of wild plants and animals, share your findings through the app, and engage with the community as your observations are identified. Remember to mark anything planted or cared for by people as “captive” or “cultivated” to ensure accurate data. By participating in the City Nature Challenge, you will not only contribute to global biodiversity research but also gain a deeper appreciation for the natural world around you.

Friday, November 15, 2024 in Natural History Museum of Los Angeles County

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 11, 2025 - Diana Ionescu

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

Yellow single-seat Japanese electric vehicle drivign down road.

The Tiny, Adorable $7,000 Car Turning Japan Onto EVs

The single seat Mibot charges from a regular plug as quickly as an iPad, and is about half the price of an average EV.

June 6, 2025 - PC Magazine

People riding bicycles on separated bike trail.

With Protected Lanes, 460% More People Commute by Bike

For those needing more ammo, more data proving what we already knew is here.

1 hour ago - UNM News

Bird's eye view of half-circle suburban street with large homes.

In More Metros Than You’d Think, Suburbs are Now More Expensive Than the City

If you're moving to the burbs to save on square footage, data shows you should think again.

3 hours ago - Investopedia

Color-coded map of labor & delivery departments and losses in United States.

The States Losing Rural Delivery Rooms at an Alarming Pace

In some states, as few as 9% of rural hospitals still deliver babies. As a result, rising pre-term births, no adequate pre-term care and "harrowing" close calls are a growing reality.

June 15 - Maine Morning Star