Leviathan Feather

The Leviathan Feather is a treasure in Pikmin 2 that is actually a feather. It can be found on the 1st sublevel of the Snagret Hole near the hole leading to the next sublevel.

Captain Olimar's Journal
"This appears to be a huge bird feather, but I've never seen the creature it once belonged to. I wonder if I ever will. I've only seen a few airborne creatures on this planet. I wonder why? Maybe it's just because I haven't encountered them yet. Oh no... What if they saw me take this feather? They could be watching me, waiting for the perfect moment to take their sweet revenge!!"

Sales Pitch
"All that's been discovered of this titanic bird is a single feather. Whatever did it look like? Your imagination is the only tool needed to paint a picture of this dream (or nightmare) bird!"

Trivia

 * It is tied with the Arboreal Frippery, Compelling Cookie, and King of Bugs for the least valuable treasure.
 * The Leviathan is a gigantic sea snake in some versions of the bible.