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Caterpillar

I believe this is a caterpillar of the southern pine sphinx. It was on a fern in a pine forest.

Southern Pine Sphinx (Lapara coniferarum) caterpillar getting attacked by a wasp.

Large, about 3 inches.

Parasitized, dead caterpillar

On Amsonia plant

Boulder Picnic

feeding on leaves of Amsonia

Nectaring on phlox in front of the Nature Center

Little white eggs left on leaves and fruit of potted citrus trees. Updated to show caterpillars!

Unsure which sub species

Feeding on gas plant

leucistic Eastern Black Swallowtail butterfly

Santa Ynez Canyon

Several found on Amsonia tabernaemontana.

75% sure on ID. Coloration is odd, and throwing me off.

ovipositing on Amelanchier

on alder

Pale Swallowtail ovipositing on domestic peach. See https://www.inaturalist.org/observations/84788703

Laying eggs on weeping willow

Laying eggs

Laid eggs on our weeping plum tree.

Possibly ovipositing on willow?

Seen during the annual Big Bear Summer Butterfly Count. A female swallowtail was observed ovipositing on willows, most likely arroyo willow. The second image shows one of the freshly laid eggs.

Ovipositing in Sycamore

I watched a western tiger swallowtail oviposit this egg and several others on apple tree leaves.

Laying eggs on paper birch