From lexicon at bionicle.com

Sand Tarakava
A desert-dwelling breed of Tarakava.

Kuma-Nui
A giant rat Rahi.

Vatuka
An elemental rock creature.

What do you think?

The Sand Tarakava was a prototype Tarakava made with yellow parts, the the Kuma- Nui is the combined form of Muaka and Kane-ra .

The Sand Tarakava is a set that was probably going to be released before but scrapped (you can find pics at www.maskofdestiny.com) and the Kuma Nui was a rat rahi fromed when Muaka and Kane-Ra join/fue/meld/wotever

What about Vakuta?

Who on earth is Vakuta? I've never heard of him before!

Vakuta is the giant big rock monster you have to defeat in the GBA game in order to save Whenua. Hope that explains it.

Yeah that helps, thanks

the vatuaka Isn't even lego technic which is kinda stupid