TARDIS zoo

The TARDIS zoo was a room in the Doctor's TARDIS.

History
Most of the animals in the TARDIS zoo were endangered and so the Doctor hoped to relocate them into a suitable habitat. The were kept in synthetic habitats that were small cuboid boxes. The Sixth Doctor brought a Kymbra Chimera into the zoo while it was disguised as a Swuffle. It broke free and caused a small amount of damage that resulted in several other creatures escaping. (DWM: Changes)