UnScramble this Word: a r e v n i g?

Questions

The ______, the unique member of the family dungongidae, is a large and long-lived marine mammal that may have contributed to the myth of mermaid sightings?

Birds with the Largest Wingspan, 1st place goes to?

Birds with the Largest Wingspan, 2nd place goes to?

Birds with the Largest Wingspan, 3rd place goes to?

With a distance of 19,000 kms (11,806 mi), this bird holds the record for the furthest migration route?