A new study, led by Dr. Gerardo Ceballos from the National Autonomous University of Mexico (UNAM), and published in the journal Nature, has found that the existence of more than 500 animal species remains uncertain. This means that these species have not been seen or recorded for an extended period of time, and it is not known whether they are still in existence or have gone extinct.

The study analyzed information from various sources, including the International Union for Conservation of Nature (IUCN) Red List of Threatened Species, and found that there are 571 animal species that meet the criteria for being considered "data deficient." These species include a wide range of animals, from mammals to birds, reptiles, and amphibians.

Among the most notable species listed as data deficient are the northern hairy-nosed wombat, a small mammal found in Australia; the pink-headed duck, a colorful waterfowl found in India and Southeast Asia; and the Chinese giant salamander, the largest amphibian in the world.

The reasons for the lack of information on these species vary. Some of them live in remote and inaccessible areas, while others may be rare or secretive in their behavior. In addition, some species may have been extirpated from certain regions but still survive in other areas.

The study conducted by Dr. Ceballos and his team highlights the need for further research and conservation efforts to determine the status of these data deficient species. This information is critical for developing effective conservation strategies and preventing these species from going extinct.

It is important to note that the lack of information does not necessarily mean that these species are extinct. Some data deficient species may still be discovered or rediscovered, as there are ongoing efforts to survey and document species in various parts of the world. Therefore, it is crucial to continue penelitian and monitoring to gain a better understanding of the status of these uncertain species and ensure their future survival.