For whatever reason, you're supposed to count butterflies with 頭 tou, the counter usually reserved for big animals like cows and elephants; sometimes 貫 kan is used to mean a pair of sushi, instead of one; the same 帖 jou counter represents groups of 10 when counting paper-like nori seaweed, 100 when counting tissue paper, 20 when counting small-sized washi rice-paper sheets, and 48 for Mino washi, a kind of paper traditional of Gifu prefecture. For someone not familiar with Japanese, Chinese, or other languages that depend on vast amounts of counter words, all this might sound like a terribly backwards way of counting.