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City Nature Challenge is an annual international bioblitz where cities engage in a friendly competition to see who can gather the most observations of nature, find the most species, and engage the most people. This is a 2-part event that starts with an observation period (April 24-27, 2026) and an identification period (April 28-May 10, 2026). All you need to do to take part is find wildlife (plants, animals, or any evidence of life), take a picture (note the location), and share your observations through iNaturalist!

Contribute to science by documenting the biodiversity that makes our area so special. We especially need your help with more bird observations. Below you'll find a PDF on how to export your eBird data to iNaturalist.

Houston Audubon's Bolivar Peninsula and High Island sanctuaries are included in the Houston-Galveston count!

Here’s how to participate:

• Create an account on iNaturalist.org
• Use your phone or a camera and desktop computer to upload observations of wild plants, fungi, and animals onto iNaturalist April 24-27, 2026. Any evidence of life counts, including slime mold.
• Do you have particular knowledge about plants, birds, fungi, insects, etc? Explore the thousands of observations that will be made, and help provide accurate identifications from the comfort of your home.

Results are announced on Wednesday May 13, 2026