Ladybird larvae?
Ladybird lavae, almost certainly, they look like little crocodiles before they do their thing and come out what you would normally think of as a Ladybird. If you can, go stick it on a plant with aphids on it, it will eat the crap out of them and hopefully become an adult, create thousands more and eat millions of god damned aphids between them.
Anyone who grows veg in their garden loves ladybirds and hates aphids.