An animal born singly, rather than one of a multiple birth.
Animals that are no longer being raised with their siblings can also be considered singletons. Often they can be split for any of the following reasons:
- Old enough to go into separate foster homes.
- Animal was too ill to be placed in a foster home and is placed separately after healing.
- Siblings were too ill and did not make it.
- Litter is old enough that rest of siblings were already adopted.