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 titles for series one often featured Moore playing the series' theme (later released on the B-side of the 1965 "Goodbyee" single release) in a variety of unusual locations, such as in a car wash, on a violin at a Gypsy cafe, and as a one-man band. From series two onwards, episodes usually began with a sketch based primarily around revealing the words "NOT ONLY... BUT ALSO..." in huge letters placed in obscure places (for example, the aircraft carrier "Ark Royal"). Every edition except (possibly) the pilot concluded with a performance of arguably Moore's best known composition, "Goodbyee", sometimes involving the