Drowning caterpillar

Drowning caterpillar

Observation - Drowning caterpillar - UK and Ireland. Description: Found in a bucket of water in my garden - not swimming very well. Removed and seems to be doing OK on dandelion and grass. (13/iii) A few days ago it stopped eating although continued moving around in the pot. New picture (on pot lid with ruler) show

Found in a bucket of water in my garden - not swimming very well. Removed and seems to be doing OK on dandelion and grass.

(13/iii) A few days ago it stopped eating although continued moving around in the pot. New picture (on pot lid with ruler) shows how it looks now. Possibly pre-pupal.