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
People Can Fly and wanted to return to making their own IP. While the exact details of the split were not made public, Wojciechowski described it as a "real management buyout". The company retained the "Bulletstorm" franchise and revealed an unannounced project based on Unreal Engine 4. People Can Fly continued working with Epic Games on their projects "Fortnite" and "Spyjinx" while also developing their own IP. People Can Fly opened a development studio in Newcastle, UK, in September 2017, which included a number of former Ubisoft developers among others. They opened a second Poland studio in Rzeszów in May 2018, bringing on