National Insect Week returns in 2020
(Ancient Greek - short-lived = sheath ; pteron = wing)
Mainly aquatic, found near rivers and ponds, large wings, three "tails", large compound eyes
There are lots of contenders here – possibly the pretty red and blue rove beetle Paederus – very, very tiny amounts of its poison have been used to cure chronic ulceration in people. Ladybirds are pretty poisonous (and pretty) and can bleed foul-tasting poisonous brightly coloured blood from their knees.