Some mating systems.

• Monogamy = 1 male, 1 female
  
  
  
  
  
• Polygyny = 1 male, more than 1 female
  
  
  
  
  
  
  
• Polyandry = 1 female, more than 1 male
  
  
  
  
  
  
  
• Polygynandry = more than 1 male, more than 1 female.