After you've found and tamed one they can be re-skinned to look like one of 16 different yukkuri (you'll need dye to change the breed). The text is just creative use of a nametag.
They still act like LittleMaids though, so other than eating sugar they're not very yukkuri-like.
To be honest if I were playing minecraft, I would prefer a separate mod for the yu's, since between choosing the maidos that can become sexy maidos and the manjuus, I choose the maidos, sorry it's a no brained, I rather have yu's as another mob ala Mo's Creatures...