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
Go I Know Not Whither and Fetch I Know Not What Go I Know Not Whither and Fetch I Know Not What Go I Know Not Whither and Fetch I Know Not What (, translit. "Poydi tuda, ne znau cuda, prinesi to, ne znau chto") is a Russian fairy tale collected by Alexander Afanasyev in "Narodnye russkie skazki". A royal hunter shoots a bird; wounded, it begs him not to kill it but to take it home, and when it goes to sleep, strike its head. He does so, and the bird becomes a beautiful woman. She proposes that they marry, and they do. After the marriage, she sees how hard