Information on twins, triplets, quadruplets, quintuplets and higher order multiples. Features a database of multiple birth families, statistics, basic information on twinning, world records and information on fakers.

Twin Connections celebrates the unique and mysterious bond between twins by providing a place for twins, and their families and friends, to share and read twin stories and photos, learn interesting twin facts and news and join an online twin community.

From 2127, most babies will be twins. This site explains why evolution predicts this.

This site is built for all those that want to learn more about twins and is dedicated to those that are twins and proud of it.

A resource for understanding twins and sharing information. Surveys, facts, news, trivia, links.

Mirror twins from Australia share photos, twin stories, links and information on twin festivals and celebrations.

Bulletin boards, twin games, photo gallery, information for parents, TV and movie twins, twin events, and information.

A non-profit, family-oriented organization to promote the spiritual, intellectual, and social welfare of twins and multiples throughout the world.

Offerings include a twin casting agency, twin events, reunion of twins placed for adoption or separated at birth, message boards, links, photos, contests, and research.