From Creatures Wikia
The Aardvark Mower can be pushed by your Creatures. "A mower in tribute to TheAardvark!" This cuts down the grass the Grazers eat in the Norn Terrarium. This piece of machinery is for use with C3 or Docking Station docked with C3.
Warning: This injects just fine to the Norn Terrarium on my system, but disappears if left-clicked on by the Hand twice.