This means that there is not enough information available to assess its conservation status.
There are several reasons for this:
* Limited research: The hourglass dolphin is a relatively rare species, inhabiting remote waters in the Southern Ocean. This makes it difficult to study and collect the data needed to assess its population size and trends.
* Uncertain threats: While some threats, like bycatch in fisheries, are known, their full impact on the species is still unknown.
It's important to note that even though they are not officially endangered, the limited data and potential threats make it crucial to continue research and monitor their populations.