Looper caterpillar

I found this little green caterpillar, not much more than a centimetre long, dangling from a silken thread under a twig of an alder tree. I gather that a lot of small caterpillars that are hunted by tits and warblers use this as a ‘last resort’ escape mechanism. When I put it back on a leaf it showed two other anti-predator behaviours, first aligning itself with the edge of the leaf and then ‘freezing’, like a tiny green twig. Must be a hazardous life for these bite-sized caterpillars at the moment, when tits have so many mouths to feed.