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
Swim That Rock York Times" review. Swim That Rock Swim That Rock is a book by John Rocco, a children's author/illustrator, and Jay Primiano, former Charlestown Parks & Recreation Director. It was published by Candlewick Press in 2014 and is Primiano's first book. Its lexile score of 750L makes it appropriate for readers aged 12–18 years. "Swim that Rock" follows a teenager named Jake Cole after his father disappears while at sea. Jake must work as a fisherman to help his family repay a loan, or else face moving away from his East Coast home. The book was positively received by critics. Although