Artic tern is a small bird that takes the longest migration of any bird
It flies over 21,750 miles ( 35,000) each year roughly the circumference of the earth . They live in large groups called colonies

i have been thinking again about migration and emigration and been looking at artic terns. i discovered that 'Immediately before beginning migration a noisy colony of birds suddenly becomes quiet and they all take to the air and fly away this behaviour is called ‘the dread’ i wonder if there was the same 'dread 'before emigrating