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A collection of images from the Sonoran Desert including cactus, birds, dragonfly and moon,

Signs of the Season Phenology Walk Late December

8 – 9 a.m., Dec. 21, 2025

Details of Solstice River Clean Up over blue wavy lines

Solstice River Clean Up

9 – 11 a.m., Dec. 21, 2025

Image of the flowing Santa Cruz River

Living River Ramble December

9:30 – 10:30 a.m., Dec. 21, 2025

Bird flying over head with words El Rio Preserve

Birding at El Rio Preserve (January)

8 – 10 a.m., Jan. 6, 2026

Image of a phone with the camera pointing to a hummingbird. Text describes how this is a Smartphone Photography Walk.

Smartphone Photography Walk : El Rio Preserve (January)

8:30 – 10 a.m., Jan. 7, 2026

Image of water with brown hills behind the water and the words Nature Trek at El Rio Preserve

El Rio Preserve Nature Stroll (Early January)

8 – 9:30 a.m., Jan. 8, 2026

A collection of images from the Sonoran Desert including cactus, birds, dragonfly and moon,

Signs of the Season Phenology Walk Early January

8 – 9 a.m., Jan. 11, 2026

Image of water with brown hills behind the water and the words Nature Trek at El Rio Preserve

El Rio Preserve Nature Stroll (Late January)

8 – 9:30 a.m., Jan. 22, 2026

Santa Cruz River image from the Sonoran Institute website

Santa Cruz River - Highlights from a Living River (Virtual Event)

Noon – 1 p.m., Jan. 22, 2026

A collection of images from the Sonoran Desert including cactus, birds, dragonfly and moon,

Signs of the Season Phenology Walk Late January

8 – 9 a.m., Jan. 25, 2026

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We respectfully acknowledge the University of Arizona is on the land and territories of Indigenous peoples. Today, Arizona is home to 22 federally recognized tribes, with Tucson being home to the O’odham and the Yaqui. The university strives to build sustainable relationships with sovereign Native Nations and Indigenous communities through education offerings, partnerships, and community service.

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