The City Nature Challenge took place between Friday 25 April and Monday 28 April 2025. There were 669 cities in 62 countries on 6 continents participating!
- For the first time ever, over 100,000 people took part!
- More than 3 million observations were made during the challenge — compared to 2.4 million last year!
- In just one day, 1 million observations were uploaded to iNaturalist (it took nearly 7 years to reach that number when iNaturalist first started!)
- More than 50,000 species were recorded in a single day — about 1 in every 40 known species on Earth!
You can read more, including information on previous City Nature Challenges, here.