From Creatures Wikia
The Grendel Cage will be imported into the garden. After the light stops flashing, the trap is set. When the grendel gets close to it, it will grab him and lift the cage up into the air. You can release the grendel by pushing the down arrow, and the trap will reset in a few seconds.
If you wish to disable the trap without removing it, wait until it is down on the ground, and press the metal ring above the cage. This will disembark all passengers and raise the trap into the air. Pressing the down arrow again will reset the trap.
It uses the following C1 class number:
- 2 3 100
and is available at TazzMann's Creatures Universe.