LucasArts has answered the following question:

What is this Maru craft I keep hearing about in Star Wars: The Clone Wars?

The Maru is a creature native to the Kashyyyk System, and has been domesticated by the Wookiee colony inhabiting Alaris, the small moon orbiting their home world. The Wookiees raise the Maru as a beast of burden, and as a means of transportation. It is a reptilian creature, agile and dexterous, possessing a long tail that it uses to attack enemies. The Maru's saddle is equipped with dual bowcasters and a seismic pulse cannon allowing it to fend off some of the Kashyyyk forest's nastier predators.

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Posted: by Jedi Power