What's in a Name?

Maybe I didn't have time to put out the garden moth trap last night, but my trip out with the Invertebrate Group yielded some fine moths in the wild. My top find was this Oak Eggar Moth, so-called because the shape of its cocoon is acorn-like. In extras is the Northern Spinach. Not sure where it gets its name from as it inhabits peat moorland and grassland, and the larvae feed on bilberry.