Temporary space

When a pet's acquisition exceeds the number of empty territory slots, temporary space is created to accommodate the excess pet(s). Temporary space can be thought of as "borrowed" against the server: The instant it is empty, it will disappear, no longer capable of holding pets. It is not possible to selectively retain temporary space by keeping the offspring that created it. Any space occupied over the current maximum is temporary, and will disappear as soon as it is empty, regardless of which pet's removal emptied it.

If territory slots are purchased up to or beyond the number of temporary slots filled, they will become permanent, but will not exist in addition to the purchased slots; they were paid for.

Creation
Although the receiving player must have at least one empty territory space in order to confirm breeding, that space is not reserved and can otherwise be filled. Thus, it is possible to breed multiple pairs, fully occupy one's territory, and then have the offspring from those pairs create temporary space as they are born.
 * Breeding

Note that while misuse of this mechanic is not a violation of Novilar rules, it will, if heavily abused, create difficulty navigating the abuser's territory; and will eventually necessitate the release or giving-away of many unwanted pets if the player ever intends to breed or use a totem again.

The more common reason offspring occupy temporary space is the unexpected birth of twins or triplets.

Purification does not check whether space for it exists within the purifying player's territory, and thus on success with a fully territory, the new pet will occupy temporary space.
 * Purification