At one time extinct in the wild (in Mongolia, the last wild Przewalski's horses had been seen in 1966), it has been reintroduced to its native habitat in Mongolia at the Khustain Nuruu National Park, Takhin Tal Nature Reserve, and Khomiin Tal.
A server is a computer or device on a network that manages network resources. Servers are often dedicated and they perform only their server tasks.
So, while the existence of files on a machine does not classify it as a server, if it uses some mechanism to share these files then it can be a file server. Similarly, web server software can be run on any capable computer, and so a laptop or personal computer can fulfill the role of a web server. In the hardware sense, the word server typically designates computer models specialized for their role.