* Grey Wolves: Wolves often mate for life and live in family packs that work together to raise pups.
* Albatrosses: These birds are known for their elaborate courtship rituals and strong bond, often staying together for many years.
* Bald Eagles: Once they find a mate, they typically stay together for life, sharing in nest building and raising chicks.
* Gibbons: These primates form strong bonds and often sing duets together, demonstrating their commitment to each other.
* Beavers: Beaver pairs work together to build dams and raise their young, maintaining a strong partnership.
* Lovebirds: These parrots are known for their affection and strong pair bonds.
* Emperor Penguins: These birds make incredible journeys to find mates, and the male stays with the egg, keeping it warm for months, while the female goes to find food.
It's important to note that even within species, there can be individual variations in behavior. Also, "loyalty" can encompass different aspects of relationships beyond just staying together, like shared parenting, protection, and mutual support.