The BioDiverCiutat, started in 2016 as a competition between Los Angeles and San Francisco, has become an international event that motivates people from all over the world to find and document wildlife in their own cities. Directed by the Community Sciences teams of the California Academy of Sciences and the Los Angeles County Natural History Museum (NHM), the BioDiverCiutat is an annual global bioblitz held four days in late April, on which the cities compete. in a friendly way to see what it is to achieve when all work towards a common goal.