Cities around the world collaborate to share observations of nature in the 2024 City Nature Challenge.

Started in 2016 as a competition between Los Angeles and San Francisco, the City Nature Challenge has grown into an international event. The City Nature Challenge is an annual four-day global bioblitz at the end of April, where cities are in a collaboration-meets-friendly-competition to see what can be accomplished when we all work toward a common goal.

The 2024 City Nature Challenge takes place in 2 parts:

  • 26 April–29 April: Taking pictures of wild plants and animals
  • 30 April–5 May: Identifying everything found

Results will be announced on Monday May 6, 2024.

Download the iNaturalist app to your mobile device. Use the app to upload photos of organisms to iNaturalist NZ, and our friendly community will help you identify them. It's as simple as that! You can also add observations straight to iNaturalist.NZ on the web ( if you prefer.

Rights: iNaturalist NZ – Mātaki Taiao

iNaturalist NZ – Mātaki Taiao

This OCS project can identify plants and animals or act as a way of collating data about the diversity of plants and animals in your area.

Has your city registered? See below to find your place and what events are on. If we have missed any locations, please do email us

For more information and to register: or

Related content

Find out more about the iNaturalist citizen science project.

The Connected article The war on weeds, describes how school students helped scientists combat the spread of weeds using iNaturalist.

The Hub has extensive resources about New Zealand’s native flora, fauna and fungi and why conservation and restoration are important. Find out more about biodiversity, or check out our topic collections: estuaries, plants, birds, reptiles and amphibians, butterflies and moths, fungi and invertebrates.

Here are some planning tips for when you intend to use a citizen science project with your students.

See all events