Battery cage chinchilla and foxes in fur farming, and most recently for the Asian palm civet for kopi luwak production of coffee. An early reference to battery cages appears in Milton Arndt's 1931 book, "Battery Brooding", where he reports that his cage flock was healthier and had higher egg production than his conventional flock. At this early date, battery cages already had the sloped floor that allowed eggs to roll to the front of the cage, where they were easily collected by the farmer and out of the hens' reach. Arndt also mentions the use of conveyor belts under the cages to
Ugolnye Kopi Ugolnye Kopi Ugolnye Kopi (, lit. "coal mines") is an urban locality (an urban-type settlement) in Anadyrsky District of Chukotka Autonomous Okrug, Russia, located east of Anadyr, the administrative center of the autonomous okrug, on the opposite side of the Anadyr River. It served as the administrative center of Anadyrsky District until June 2011. Population: with an estimated population as of 1 January 2015 of 3,666. It is a mainly mining town that also hosts the region's main airport. Traces of fossil flora and fauna dating to the late Cretaceous and Paleocene were discovered on the territory of modern Ugolnye