Not much available for the hungry in the Sonoran Desert in December: but a bunch of likely Soldier butterflies, Danaus eresimus, a Monarch cousin lookalike, feed on what looks to be Mistflower in Tucson’s Tohono Chul garden.
A sweat bee on, possibly, Tetraneuris scaposa, Four nerve daisy.
Amazing how many milkweeds are adapted to different biomes. Here we have Pineleaf Milkweed, Asclepias linaria.
An unknown (to me) caterpillar, possibly a Tussock Moth caterpillar, -one of many on a roadside wall at 5000 ft.
At a higher elevation, maybe 6000 feet -cactus, moss, and snow.
You can identify this Monarch lookalike by its white spots on the tops of wings.