Pile of caterpillars to id

[Tuffykins]

I have been pulling my hair out trying to find out what these caterpillars are that are in piles on scrubland feeding on unknown plant in central Portugal.

[aeshna5]

Not sure about this, but they remind me of Oak Processionary Moth larvae.

[Tuffykins]

That did cross my mind but they are feeding on a plant on the ground and don't seem to move from the ground, as soon as the plant flowers I should be able to id it and that may help.

[Dogghound]

These are Thaumetopoea herculeana, this species is common in Iberia but not found in Britain.

[Tuffykins]

Phew, thank you so much, that is exactly what they look like.
Do you happen to know if they are as dangerous to dogs as the pine processionary caterpillar is, which is also here.

[aeshna5]

Originally Posted by Dogghound

These are Thaumetopoea herculeana, this species is common in Iberia but not found in Britain.

So the same genus as the Oak Processionary. Thought they looked similar.

[Dogghound]

Yes Aeshna a very similar species. they look very cool with their bright green hair.

I would either move them or keep the dog away, the hairs can cause breathing problems, rashes, skin allergies and conjunctivitis amongst other things.

[Tuffykins]

Many, many thanks for all the info. These caterpillars are randomly spread in piles all over my dog walking area, will now be very vigilant.

[Lance Morgan]

They feed on Cistus (rock rose).