City Nature Challenge 2021 - London

A hedgehog on a grass lawn

Take a closer look at nature in London by joining cities around the world to find and identify wildlife on your doorstep between 30th April and 3rd May.

People in over 400 cities worldwide, including 13 others in the UK, will be finding, and recording wildlife in a four-day period. Anyone can join in the challenge, wherever you are in Greater London. 

City Nature Challenge is a BioBlitz event, where people attempt to find, identify, and record living things within an area, in a set time. Look for nature in your garden or home and help us record as much wildlife as you can within Government Coronavirus (COVID‑19) rules - the information collected will create a valuable snapshot of London’s biodiversity.

City Nature Challenge: London is being led by the Museum in partnership with the Royal Parks, University College London, the Field Studies Council, the Linnean Society, Friends of Tower Hamlets Cemetery Park, the London Environmental Educators Forum and London Social Farms and Gardens.

At a glance

Discover wildlife in London and help scientists understand more about urban nature.

Type of activity: Outdoors

Who can take part? Everyone

When? Friday 30 April - Monday 3 May 2021

Where? Anywhere in Greater London

How long will it take? About two minutes per observation

Cost: Free

How to take part

  1. Download
    All you need to get started is a smartphone with the FREE iNaturalist app downloaded, or a camera to take photos of what you see and upload to the website later. You can download a guide (PDF 221KB) to using the app.
  2. See it
    Find nature: between 30 April and 3 May 2021, within Government guidelines, explore nature in and around your home, anywhere in the UK.
  3. Snap it
    Take a picture: of wild plants, animals, or fungi that you find. If they are not wild, for example domestic animals or planted flowers, be sure to mark them as captive/ cultivated.
  4. Share it
    Share your observations: record what you find by uploading a picture (with location) onto the iNaturalist app or

Tallying the results

Between 4-9 May 2021 everyone's observations are identified and counted. You can see how many wildlife observations have been recorded on the City Nature Challenge 2021: London project page (or check out results from other UK cities taking part).

You can help to identify other people’s wildlife observations and learn more as others identify your wildlife observations.

The worldwide competition results will be revealed at on Monday 10 May 2021.

Ideas for activities

Need more inspiration on finding and recording nature in London? Here are some ideas:


Follow the action

Join the City Nature Challenge London 2021 project on iNaturalist to stay updated on what Londoners have found.

Share your discoveries on social media and follow #CityNatureChallenge or #CityNatureChallengeLondon for news from London and cities around the globe.

Find out more

You can keep up to date on the progress and results from the City Nature Challenge by following the Citizen Science team's posts on the NHM blog.


City Nature Challenge 2021 around the UK

Fourteen UK city regions are collaborating with 400+ cities across the world to record wildlife from 30 April – 3 May but you can join the challenge wherever you are in the UK by using iNaturalist to record any wildlife you see. 

Useful links

City Nature Challenge is organised by:

Logos of California Academy of Sciences and Natural History Museum Los Angeles County

Supporting organisations