A．They migrate to the Arctic Circle during the summer.
B．They originate from Devon Island in the Arctic area.
C．They travel as far as 400 kilometers in search of food.
D．They have the ability to survive in extreme weathers.
A．They were carried by the wind.
B．They had become more poisonous.
C．They were less than on the continent.
D．They poisoned some of the fulmars.
A．The threats humans pose to Arctic seabirds,
B．The diminishing colonies for Arctic seabirds.
C．The harm Arctic seabirds may cause to humans.
D．The effects of the changing climate on Arctic seabirds.