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 Water Is Wide (song) water is wide, I cannot cross o'er, And neither have I the wings to fly. Build me a boat that can carry two And both shall row, my true love and I. A ship there is and she sails the sea She's laden deep, as deep can be. But not so deep as the love I'm in, And I know not if I sink or swim. I leaned my back against a young oak, Thinking 'twere a trusty tree. But first it bent and then it broke, Thus did my love prove false to me. O love is handsome and