Sapphire Jewel. Blue leaf-rolling weevil or vine weevil, Byctiscus betulae, Belgium. Weevils are one of the most diverse superfamilies on earth. Around 97.000 species have been described. They come in all kinds of shapes, colors and sizes. This flashy species is found in most parts or Europe. It a rolls up several leaves into the shape of a cigar. The female lays her eggs in it. The leaf will drop to the soil, where the larvae will develop. Photographers of Threads Show me a striking animal.