This is bird note.

Mating for life may be the human ideal, but most bird species in North America mate for a single breeding season.

Some may team up with the same mate the following year, just because both stay in or return to the same territory,

but such togetherness is relatively rare.

Because most birds of the North Temperate Zone migrate, remaining in touch with a mate throughout the Ottoman winter is difficult.

For instance, fewer than one-fifth of song sparrow pairs are reunited.

For long-term fidelity, look among the larger birds.

Large resident birds such as hawks, eagles, and ravens have wide territories,

meaning few contacts with the opposite sex.

Maintaining a relationship through the winter may assure

breeding in the next season. You'll often see such birds in pairs throughout the year.

Most seabirds meet and breed in colonies, but marbled murrelets, little relatives of puffins,

breed inland in old-growth forests.

They have no chance to meet each other in a colony, so when a male and a female get together, they stay together.

In the animal realm, birds still provide the best examples of seasonal mate fidelity.

Most birds form devoted pairs for at least each breeding season,

not something that can be said for most mammals.

For bird note, I'm Michael Stein.