Here's why:
* Data Collection is Inconsistent: There is no central, global database that tracks the number of captive dolphins. Information is gathered from various sources, including individual facilities, government agencies, and non-profit organizations. The quality and consistency of this data vary greatly.
* Different Definitions: The definition of "captivity" can be unclear. It includes marine parks, aquariums, research facilities, and even private ownership. This makes it difficult to compare numbers across different contexts.
* Changing Numbers: The number of dolphins in captivity is constantly changing due to births, deaths, transfers between facilities, and changes in regulations.
However, estimates suggest there are likely thousands of dolphins living in captivity around the world.
Organizations like the World Animal Protection and the Dolphin Project work to gather and analyze data on captive dolphins. They are valuable sources for information and advocacy efforts.
It's important to note that the ethical implications of keeping dolphins in captivity are a topic of ongoing debate.