What do the all of the mammals living on Mount Fuji have in common

I have a report and I have to go in depth in mammals. Some animals include Japanese serow, Asiatic black bears and Japanese squirrels and foxes.
I know this is my own homework, but I really can't find out! No silly answers please.
Thanks!

That's a really good question. In trying to answer the question I've been to numerous websites (as you should have done), and I can't find a common link in folklore, or endangered species status or preferred habitat. Life at a common elevation on Fuji also seems not to be true. Maybe common to subalpine areas, but the data on the fox is lacking.

But I've learned a lot about serow, black bears, japanese squirrels and japanese fox. For that I am most grateful.

One thing I CAN tell you is that the respondent who told you that they all live in the same environment is way off base. Fuji is over 12,000 feet high, and the environments (climates) on the mountain proper change from temperate at the base to alpine-glacial at the top. That's hardly "the same environment."

They all have in common that they are living in the same environment (what are the physical factors of Mount Fuji), they are all living in the same vegetation community (what are the plant communities there), and they are living in the same weather and climate conditions.