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5. Flamingos
Flamingos are sociable animals, living together in large colonies. During mating season, they split off into smaller groups and perform synchronised displays. They choose their mate and stay together for the season. They generally have a new mate for every mating season.
The most famous same-sex flamingo couple is Carlos and Fernando. In 2007, when they had been together for five years, they adopted an abandoned chick. They fed it and raised it as their own. Homosexuality is said to be very common with flamingos.