Stallions are just male intact horses, they are not in reference to a separate species of horse. Therefore the question has no merit.
Stallions is the plural.Stallion is the singular.
Like any other stallions do.
Doncaster Stallions was created in 1969.
Augusta Stallions ended in 2002.
Augusta Stallions was created in 1999.
Houston Stallions was created in 2010.
Oklahoma Stallions was created in 2010.
Birmingham Stallions was created in 1983.
Birmingham Stallions ended in 1985.
Boise Stallions ended in 2001.
Boise Stallions was created in 1999.
Dallas Stallions ended in 1999.