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A cuckoo finished
of the longest
by a bird. The cuckoo left its
home in Zambia in March and flew to Mongolia. Scientists named the
Onon, after a Mongolian
. They micro-chipped five cuckoos last
to track their
and monitored the birds across the Indian Ocean and Asia. Onon was the
to make the
from Mongolia to Zambia and back. The scientists called it "a
journey".