Swans - Swans are often seen as the epitome of romantic animals, due to their tendency to mate for life and their graceful movements when swimming together.
Gibbons - Gibbons are primates that form monogamous pair bonds, and they are known for their loud and melodic vocalizations that they use to communicate with their mates.
Penguins - Penguins are known for their elaborate courtship rituals, such as presenting their mates with pebbles, and for their tendency to mate for life.
Mandarin ducks - Mandarin ducks are known for their strikingly beautiful plumage and their habit of forming strong pair bonds that last throughout the year.
Albatrosses - Albatrosses are birds that also mate for life and are known for their elaborate courtship dances, which involve bowing, preening, and clapping their wings.
Prairie voles - Prairie voles are small rodents that are known for forming monogamous pair bonds, which is unusual among mammals.
Gray wolves - Gray wolves are highly social animals that form strong bonds with their mates and often mate for life.
Bonobos - Bonobos are primates that are known for their highly sexual and affectionate behaviors, which can include kissing, hugging, and genital touching.
Bowerbirds - Male bowerbirds are known for building elaborate structures called bowers to attract mates, and they often decorate these structures with brightly colored objects and other decorations.
Seahorses - Seahorses are known for their unique reproductive behavior, in which the male carries the developing embryos in a pouch on his belly. They also form pair bonds and often perform elaborate courtship dances.