As spring approaches, most birds have only one objective, reproduction. This period of reproduction is essential for the survival of the species.

For many species, pairs are already formed during the winter, for others pairs are formed during this period....

Some species of birds are loyal all their lives; others change partners each season, finally in some species the male mates with several females and does not participate in the rearing of the young.

Quarrels in birds can have several origins,

• the conquest of a female, the males in breeding plumage seek to attract the female, and compete in style and presence,
• the conquest of a nesting territory, this choice is vital depending on the security it offers to build a nest there,
• protection against intrusions from other birds on nesting or feeding grounds.

Some birds remain loyal to their nesting and breeding grounds year after year. .

The formation of couples and the ceremony of seduction give rise to various demonstrations, the most common of which is the donation of food. In terns the offering of a small freshly caught fish is part of this ritual, while in European bee-eaters the offering will be an insect (bee or dragonfly).

In the ceremony of seduction, there are also spectacular courtship displays. Among the Great Crested Grebes we witness extraordinary aquatic dances, Mr. and Mrs. participate in this aquatic ballet. With the Greater flamingos the parades are done in groups with a very well regulated and very presided choreography. This behavior is linked to the fact that these birds are very gregarious and live in large groups.

In other species, this seduction ceremony manifests itself in a more or less melodious sound way. In White Storks this ceremonial is manifested quite loudly by the "clicking" of their beak.

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