These are the only mates for life I could find so far. Monogamy is rarer than I thought.

  • Castor - Beavers
  • Anas platyrhynchos - Mallards 
  • Corvus corax - Ravens 
  • Hylobates lar - Gibbons  
  • Cygnus buccinator - Swans 
  • Psittaciformes - Parrots (with the exception of the Kea and the Kakapo)
  • Aptenodytes forsteri - Emperor Penguins
  • Ceratiidae - Deep sea Anglerfish take monogamy to an extreme
  • Canis lupis - Wolves (for the most part)
  • Peromyscus californicus - California Mouse
  • Microtus ochrogaster - Prairie Voles  
  • Columbidae - Pigeons
jun 30 2010 ∞
jan 27 2011 +