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Hooded Nudibranchs "huddled" with hoods down.
Had this unique behavioural observation recently. I have already checked in with experts (Lamb, Behrens, Fletcher, Kocian) and they have also not seen this before.

I don't believe they are mating. In my observations of mating, Hooded Nudibranchs pair up and orient right-side-to-right side, bodies elongated.

Small female bee collecting hardened resin from the heart wood of a large conifer stump. According to Sheffield and Heron (2018), Dianthidium subparvum is the only Dianthidium species located in our local area i.e British Columbia Pacific Maritime.

Photo 1 to 3. Female bee collecting resin/sap.

Photo 4 to 6. Location of sap on old conifer stump.

Reference
Sheffield, C. S., & Heron, J. M. (2018). The bees of British Columbia (Hymenoptera: Apoidea, Apiformes). Journal of the Entomological Society of British Columbia, 115, 44-85.

All photos of the female were taken after conceiling its real nest (in the 2nd and 3rd pics, she is on a decoy nest) and during her return to the sea, the 5th photo depicts other tracks and the last two shots examples of the WWF work regarding protecting nests (old ones). The whole process from emerging from to return to the sea took ca. 95 minutes, the nesthole was approximately 70 cm in depth and 25 cm in width