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 +