Narrow-bordered 5-spot Burnet Moth Caterpillar Zygaena lonicerae
The caterpillars of the Five-spot and Six-spot Burnet Moths look similar but that of the Narrow-bordered Five-spot Burnet Moth (above) has visibly much longer hairs.
The eggs hatched in late summer/early autumn and the tiny caterpillar over-wintered; some overwinter twice before they have eaten enough to pupate
on a grass stem in early summer.
Narrow-bordered Five-spot Burnet Caterpillar spinning its silken cocoon on a grass stem
Pupating in the silk cocoon
The cocoon becomes papery as it ages, concealing the chrysalis inside
The adult moth has emerged from the chrysalis and cocoon (June in UK), leaving the exuvia (remains of chrysalis) on the cocoon.
Links:
6-spot Burnet Moth Cocoon
5-spot Burnet Moth