From Pikipedia, the Pikmin wiki
The Maternal Sculpture (母と子のカタチ?) is a treasure in Pikmin 2. It is actually a baby bottle top. It is located on sublevel 9 of the Cavern of Chaos. Gas pipes are found here, and there are few enemies, all of them flying: a Bumbling Snitchbug and a couple of Careening Dirigibugs. The treasure is easily within view, as is the sublevel's other treasure, the Wiggle Noggin.
“This shape resembles a mammal appendage. But I have no idea what it actually does. It's dripping with what can only be described as beast drool. I can't blame the ship for not wanting to touch it. I don't want to touch it either! But I've got a duty to my mission, and sometimes a captain has to take one for the team...”
“This shape... Though the mind forgets, the heart remembers. All sentient life-forms must recall the love of their mothers!”
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