GENERAL KNOWLEDGE: What do the initials U.F.O stand for?

Questions

One Laysan ----------, tracked by biologists at Wake Forest University, flew more than 24,843 miles in flights across the North Pacific to find food for its chick in just 90 days - a flight distance equivalent to circling the globe.?

If they are well treated, camels in captivity can live to the age of ----------?

Certain birds of prey (the African serpent eagle and the American kestrel, for example) have ---------- acuity 2.4 to 2.6 times greater than humans. They can see a 1 mm long insect from a treetop 18 meters above ground.?

The kinkajou's tail is twice as long as its body. Every night, it wraps itself up in its tail and uses it as a ----------?

The blue whale is maintained by its blubber and can go up to half a year without ----------?