This Article Contains information directly from the Pikmin Games. This article is based off of an Enemy/Treasure/Area/Cave/Pikmin/Character from the Pikmin series of Games.
The Leviathan Feather is a simply just a white feather. It probably doesn't belong to a Burrowing Snagret because it is to large to be on its white feathered head. This cheap but important piece can be found on the first sublevel of the Snagret Hole near the hole leading to the next sublevel, in what appears to be the inside of a birdhouse.