Bird migration evidence. Seabirds fly low over water but gain altitude when crossing land, and the reverse pattern is seen in landbirds. However most bird migration is in the range of . Bird strike aviation records from the United States show most collisions occur below and almost none above . Bird migration is not limited to birds that can fly. Most species of penguin (Spheniscidae) migrate by swimming. These routes can cover over . Dusky grouse "Dendragapus obscurus" perform altitudinal migration mostly by walking. Emus "Dromaius novaehollandiae" in Australia have been observed to undertake long-distance movements on foot during droughts. While participating
The Bird That Drinks Blood U dresses in what is similar to Hanbok and wears a binyeo in her hair. The Empire's system of rank and office is modeled after that of Silla and Goryeo. As Lee's all multi-volume series, such as "Dragon Raja"(1998) and "The Bird That Drinks Tears,"(2002) "The Bird That Drinks Blood" was serialized on a serial forum of an online service provider, Hitel, "from the Christmas of 2003 to Christmas of 2004, exactly a year." It is the last of Lee's works to be on the forum before Hitel's closure in 2007. It is also his longest work to date. (August