Here is a link to an interesting story about conjoined barn swallow....very rare indeed!
LITTLE ROCK, Ark. - It's an Arkansas bird story that at first might be hard to swallow. A pair of conjoined barn swallows, attached at the hip by skin and possibly muscle tissue, will be sent to the Smithsonian Institution for study and examination, Arkansas wildlife officials said Friday. If confirmed, officials say it could prove to be an incredibly rare find — a set of conjoined twins among birds.
Prairie Village, KS