Parakeets are social animals that can feel lonely and sad when they have no company. It is one of the most faithful animals to its partner. They need a partner alongside them in their cage in order to be happy, and once acquainted, they won't leave each other's side.
The scientific name of the French angelfish is Pomacanthus paru. This marine fish is notable for its loyalty to its mate. Although they do not care for their small fry once they have hatched, French angelfish mates live together forever and defend each other.
Swans are animals that live in pairs. In the winter months, they are known to already be in heat. When they meet a potential partner, swans swim near one another and perform special neck movements. Once the eggs are laid, it is the female who takes care of them,
Gibbons are a type of monogamous primate that form lifelong bonds with each other. For them, this is an advantage that optimizes their resources and lowers the amount of energy they use when protecting their territory, among other reasons.
In the summer, yellow-crested penguins return to the place where they were born in order to meet a suitable partner to form a faithful and lifelong couple. Those who are already paired up return to Antarctica to the exact spot where they last nested.
The national symbol of the United States of America, bald eagles mate for life with their partner. Bald eagles choose to be faithful until death, or until there is a problem of impotence. They build the nest together and take turns in caring for their offspring,
Owls are faithful birds and they remain monogamous to their partner, not only in breeding season, but all year round. They both work together in the care and feeding of their young.