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
Not Only... But Also of Glood"/Pete and Dud – 0-0-Dud*/Poets Cornered with Willie Rushton Music: Nanette, Dudley Moore Trio, Joe Cocker & The Grease Band Show 3: TX 18 March 1970 Railway Station Opening/Sir Arthur’s World of Worms/Pete and Dud – Racial Prejudice/In the Club*/Poets Cornered with Barry Humphries Music: Nanette; Dudley Moore Trio; Michael Chapman Show 4: TX 1 April 1970 "Not Only… But Psycho Opening"/Pete and Dud – The Futility of Life/Permission to Marry/"Good vs. Evil Cricket Match"/Poets Cornered with Frank Muir Music: Nanette; Dudley Moore Trio; Alan Price Show 5: TX 15 April 1970 Flowers Opening/Sir Arthur on Flowers/Geriatric Medicine (Undercover