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tags: conjoined twins, siamese twins, ornithology, birds, avian, barn swallows, Hirundo rustica Conjoined twin Barn swallows, Hirundo rustica, found July 17, 2008 in Searcy, Arkansas after they fell from their nest. Image: Samuel Peebles (Daily Citizen, AP Photo). Last week, a homeowner discovered a pair of young barn swallows that had fallen out of their nest after a sibling flew off to learn to forage from its parents. That's a common event, but this particular pair of young birds were remarkable: they were joined at the hip -- literally. Conjoined twins -- sometimes known as "siamese…