Black Swedish Duck Question

[cupakathy]

Hello! I have 2 female black Swedish ducks. They are 4 years old. Today, I noticed they were fighting. They have never done this before. Anyone know what's going on? Thank-you for your help!

 

[cheezenkwackers]

Premenopause

 

[Jenbirdee]

sometimes they just want to find out who is the toughest so they know who should be the leader.