Willow Flea Beetle Crepidodera aurata

A flea beetle is a leaf beetle (anagram) but is tiny and has enlarged thigh muscles to jump like a flea. The Willow Flea Beetle is a metallic green beetle with a metallic red thorax, both iridescent and varying with the light. It is 3mm short. It is native to much of Eurasia including the UK, prevalent on willows.