Summary: Higepiyo (literally "Mustache-Peep") revolves around Hiyoko, a "surreal" bird that happens to have a mustache. Hiyoko can talk with "Piroshi" — Hiroshi, the human boy who won her in a fair — and the two are tight friends. In fact, Hiyoko teaches Hiroshi how to win brawls in elementary school, and she sometimes fights a bullying girl on Hiroshi's behalf. (Hiyoko is actually an experimental test subject that escaped from a laboratory.) ~ http://forum.cireus-anime.com/showthread.php?t=7344

I didn't know that Higepiyo is a SHE and her name is Hiyoko. icon by http://community.livejournal.com/tempurahands/8323.html#cutid1