It turns out that countries all over the world have been known to use small animals as stamp art, displaying these adorable creatures on envelopes delivered everywhere. Visit Tokyo's Philatelic Museum, A.K.A. Kitte no Hakubutsukan (切手の博物館), or stamp museum, to see a whole collection of cute critters on absolutely tiny canvases. Read more here: https://www.japankuru.com/en/culture/e2025.html