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
Fly tying were "quite as suitable to designate the flies as so many nonsensical names". The others did not agree with him, but he said: "What can you do? Here is a fly intended to be a Coachman; but it is not the true Coachman; it is quite unlike it and what can you call it?" Mr. L. C. Orvis, brother of Mr. Charles Orvis, who was present said: "Oh that is easy enough; call it the Royal Coachman it is so finely dressed!" And this name in time came to be known and used by all who are familiar with the