Final answer:
The statement about Santa visiting a country south of the equator with over 1/3 of the world's animal species is plausible but requires specification of the country; equatorial regions like the Amazon are indeed rich in biodiversity.
Step-by-step explanation:
The statement that Santa traveled south of the equator to a country that is home to over 1/3 of the world’s animal species is plausible, as it is well-documented that the equatorial regions of the Earth, such as the Amazon rainforest located in South America, are incredibly rich in biodiversity. These regions contain a high number of species due to their warm climate and abundant resources, making it possible for a wide diversity of life to thrive. However, whether a single country holds over one-third of all animal species is a more complex fact that would require specification of which country is being referred to, as no single country is currently recognized as having such a high proportion of the world's total animal species. It is known, for example, that Brazil, which contains a large portion of the Amazon rainforest, is one of the most biodiverse countries on the planet.