City Nature Challenge

The City Nature Challenge is an annual, global, community science competition to document urban biodiversity.

The challenge is a bioblitz that engages residents and visitors to find and document plants, animals, and other organisms living in urban areas.

[7] The first event took place in 2016, in which Los Angeles competed against San Francisco and won in all three categories (most observations, most species, most participants).

[3][10] The 2019 challenge was more than doubled in scale and took the competition beyond its US roots, with Cape Town, winning two of the three categories.

Instead, we want to embrace the collaborative aspect of sharing observations online with a digital community, and celebrate the healing power of nature as people document their local biodiversity to the best of their ability."