At or just beyond edge of plot below rocky outcrop. Tree in full bloom and part way leafing out. Tree height approximately 40 ft.
Acc'd to our database: 'pollinated by swallowtails...' . This a tantalizing thought! But I've not seen swallowtails on this trail, unless you count Parnassians.
Pika calls heard from this location
Two males; and what I think a lady copper in a poor third photo.
Along the high trail, these were flying upslope; passing through swarms of nectaring Sierran Percopids...
Looks to me like the typical Hemileuca hera? I thought that one was more in Oregon. Since it's so pretty, I'll just post it to bug guide and get their input.