Woolly Mammoth have 9 physical mutations, four (4) of them are Mane Mutations, four (4) are Tail Mutations and the last one is the Fangs Mutation.
While it is possible to combine a Mane and a Tail Mutation, it is not possible to have two or more Mane / Tail Mutations at a time! There is one (1) exception however: Bearded may be combined with any other Mane Mutation.
Standard Mane and Tail:
Special Combination Manul:
Manul works just like Sleek for Sabers and Dire Worgs or Silkie for Terror Birds. If a Woolly Mammoth calf inherits the Manul Mane it will automatically gain the Manul Tail on top. Is it the other way around, the calf inherits the Manul Tail, it will not get the Manul Mane on top though!