https://fontainesauction.com/past-auctions/2013-past-auctions/austrian-bronze-bat-lamp-lot-415-estimate-3500-5000/
http://www.prices4antiques.com/Table-Lamp-Austrian-Art-Nouveau-Bronze-Bats-Holding-Loetz-Type-Glass-Drop-Shades-E8949056.html
http://www.fullerroberts.com/lamps/austrian-bronze-bat-chandelier-with-glass-orbs
http://www.bonhams.com/auctions/19415/lot/2463/
Today I learned that in early 20th century Austria, bronze & glass bat lamps were a thing (sources in captions)