Sentence Completion

Complete the sentence with ONE word from the passage for each blank.

The Arctic tern undertakes one of the longest migrations of any animal. Each year it travels from its breeding grounds in the Arctic to the Antarctic and back, chasing the summer at both ends of the planet. Because of this restless route, the bird experiences more daylight over the course of a year than any other creature. Although it is a small seabird, the total distance it covers across a single lifetime can exceed that of several trips to the moon.

The Arctic tern flies from the Arctic to the every year, following the in both hemispheres. As a result it sees more annually than any other animal.