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 but not all, from "Not Only ... But Also") were published in a book of that title by Methuen in 1971 (reissued 1988). Not Only... But Also Not Only... But Also was a popular 1960s BBC British sketch comedy show starring Peter Cook and Dudley Moore. The show was originally intended as a solo project for Moore, called "Not Only Dudley Moore, But Also His Guests". However, unsure about going it alone, Moore invited his partner from "Beyond the Fringe", Peter Cook, to guest in the pilot (along with Diahann Carroll and John Lennon, who was to make two more