It doesn't look spotty enough to be the Bird-cherry but there are about ten ermine moth species that look very similar and even the species guides just throw their hands up in despair rather than try to help you find the differences.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
@wild edges thanks, I was pleased to get the rolled tongue.
I found 50+ of them feeding on Thistle this morning and the below text from the internet helps with the ID I think.
Confusion species – There is a moth called the Thistle Ermine (Myelois circumvoluta) that looks similar to these, but is larger, about 1 ½ cm long, and has larger black spots. The caterpillars of this species do not form webs but feed over the winter in the stems of Spear Thistle.
I think it's too spotty to be a Thistle Ermine, especially at the head end. Annoyingly those are in a whole different family to the other Ermines. The definitive type species all seem to be ones that have been raised from larvae found in the food plant.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
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A more side on view if that helps, possibly Apple Ermine?
I found 50+ of them feeding on Thistle this morning and the below text from the internet helps with the ID I think.
Confusion species – There is a moth called the Thistle Ermine (Myelois circumvoluta) that looks similar to these, but is larger, about 1 ½ cm long, and has larger black spots. The caterpillars of this species do not form webs but feed over the winter in the stems of Spear Thistle.
Maybe this species, whatever it may be, just likes feeding on Thistle.
Like you said in your earlier post, very difficult to nail down an accurate ID.