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City Nature Challenge


Attention biodiversity and citizen science fans, please turn on your phones, download the requisite apps, and take some photos on self-guided and community nature walks. City Nature Challenge returns around the globe at the bottom of April and top of May. Get outside!

Hashtags: #CityNatureChallenge #RetoNaturaListaUrbano

Key Links

The challenge takes place in two parts:
April 29 – May 2 Taking pictures of wild plants and animals
May 2 – May 8 Identifying what was found

Questions = Preguntas

  • For those keen on urban biodiversity, what are the recommended accounts to follow on Flickr, Twitter, and YouTube? = Para aquellos interesados en la biodiversidad urbana, ¿cuáles son las cuentas recomendadas para seguir en Flickr, Twitter y YouTube?
  • Who is reporting / blogging / tweeting about city parks and urban biodiversity? = ¿Quién está informando / blogueando / twitteando sobre los parques de la ciudad y la biodiversidad urbana?
  • What would city locals like other know about nature in their cities? = ¿Qué le gustaría a la gente local que otras personas supieran sobre la naturaleza en sus ciudades?
  • How is ‘City Nature Challenge’ translated in other languages? Bonus points for Indigenous languages. = ¿Cómo se traduce ‘City Nature Challenge’ a otros idiomas? Bonus points para lenguas indígenas.

Apps: iNaturalist

  • Visit iNaturalist.org
  • Download the app from the AppStore or Google Play
  • Sign In
  • Start sharing your observations
  • Get feedback from actual scientists, experts, and other naturalists

Elsewhere on the Web
St. Louis, Missouri
Birmingham and Black Country

Nebraska hosts virtual informal ID parties daily May 4-6 1230pm-130pm to help identify observations. Details: Calendar.OutdoorNebraska.gov.

The City Nature Challenge was founded by @alisonkestrel and @lilamayhiggins and organized by the citizen science / community science teams from the California Academy of Sciences @CalAcademy and the Natural History Museum of L.A. County @NHMLA

City Nature Challenge Comes to Erie

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