Vern Fearing, The Sloths of Kruvny
“ Yuh see, they claim they made this whole durned gallstone theirselves!""Made it?" asked Brad, dully."Uh-huh." The old man spat Mercurian tobacco juice. "Just like on Earth, where myriad minute oceanic organisms pile their skeletons to form coral islands. Yuh see, the Sidemen eat radishes—love 'em, in fact—but it gives 'em gallstones. They claim this whole world is the collected gallstones of their ancestors." The old man wiped Mercurian tobacco juice from his beard and shoes. ”
