Whose caterpillar? Fritillary?

Whose caterpillar? Fritillary?

Observation - Whose caterpillar? Fritillary?. Description: Predominantly black but yellowish side stripe. Group seemed to flinch upwards in unison - a warning? On nettles.

Predominantly black but yellowish side stripe. Group seemed to flinch upwards in unison - a warning?
On nettles.