*Tweetle Beetles are a term found in Fox in Socks by Dr. Seuss. These are really gold beetles/gold bugs. The photos don't really show off their luster very well.
gold bug
n.
1. Any of several North American beetles, especially Metriona bicolor, having a golden metallic luster. Also called gold beetle.
A Beetle and a Broomstraw
A robin and a wren, as they walked along one night, Saw a big brown beetle on a broomstraw. Said the robin to the wren: “What a pretty, pretty sight— That big brown beetle on a broomstraw!” So they got their plates and knives, Their children and their wives, And gobbled up the beetle on the broomstraw.
...Nursery Rhyme
I don't think the robin and the wren are doing their jobs in my garden!