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Portrait of a flying barn swallow (rustica hirundo) in front of a blue background
A swallow feeding its chicks in flight
Swallows feeding chicks in the bright morning sun
Swallow bird watercolor illustration. Hand drawn barn swallow on a stump. Small common bird realistic image. Wildlife avian on white background
Barium Swallow study test diagnose Barrett's GI tract exam GERD ulcers series difficulty pharynx procedure UGI throat bowel therapy by fluoroscopy devices.

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