For English-speaking users...

For English-speaking users: И орешки всё грызет is a quotation from "The Tale of Tsar Saltan, of His Son the Renowned and Mighty Bogatyr Prince Gvidon Saltanovich, and of the Beautiful Princess-Swan" - an 1831 poem by Aleksandr Pushkin. This is a line from a part describing a wonderful squirrel, eating golden nuts with emerald core.