A national symbol of the USA, these birds typically mate for life, returning to the same massive nest year after year to raise their young together.

Known as the "long-distance daters," males woo their mates by presenting a perfect pebble. If accepted, the pebble serves as a "ring" to start their nest-building journey together. 3. Courtship Rituals: The Ultimate Quest World Animal Protection International | End Animal Cruelty World Animal Protection International | End Animal Cruelty. www.worldanimalprotection.org

Found across North America, these rodents are among the most monogamous mammals on Earth. They share nesting duties, groom each other, and provide the vole equivalent of "hugs and kisses" when a partner is stressed.