City Nature Challenge 2023

We are pleased to be helping to organize the City Nature Challenge (CNC) for a sixth year here in Maui. The CNC has been a friendly, global challenge among cities to see who has the most biodiversity. Started between Los Angeles and California, it spread to cities across the continental US and went international the year after. It continues to add cities across the globe each year.

This year the observing portion of the event will run from April 27-May1. You may also contribute identifications or verifications to project observations any time from May 3-8.  So, even if you can’t help observe things on Maui, you can still participate in verifying and identifying identifications!

This year, the event will not be a competition, but rather a way to bring our community together to share and experience nature.

Connect with us via the iNaturalist app to the Maui CNC2023 project here:

Get started at any time on your own by downloading the iNaturalist app on your smartphone or computer (visit

We are posting updates on our blog and to our social media accounts:


Instagram: @mauinui_natural_history

Twitter: @MauiNuiNatHist

What is the CNC?

Below is a short overview of what the CNC is all about – it’s an opportunity to help advance science by taking pictures of living things and post them on your phone or on the iNaturalist website.

How easy is it to use iNaturalist to record you observations? Super easy! The video below will show you how that works on a phone in less than 90 seconds! (Using a computer, scroll down to the next video!)

And here is how it works on a computer: