Abstract: The Lower Cretaceous Haman Formation of the Republic of Korea has yielded several localities with thousands of dinosaur, bird, and pterosaur tracks. One such tracksite is found at the Gyeongsangnam-do Institute of Science Education (GISE) in Jinju, Republis of Korea. More than 1000 bird tracks are exposed on a single bedding plane, and thousands more are found in smaller float blocks on exhibit around the museum or in storage. The morphologic and behavioral diversity is extremely high; there are more than seven different morphologies described herein, with behaviors ranging from feeding––including pecking, probing, predator-prey interactions, and scything traces––to landing and running. Arcuate traces and associated webbed-footed trackways are identical to scything feeding traces produced by the extant black-faced spoonbill (Palatea minor). Individual peck and probe marks have also been reported, and clustered probing has been observed. The behaviors at this site are strikingly modern in respect to morphology and diversity, indicating that ornithurine birds had a very modern set of behaviors and anatomy. The high morphologic diversity of track morphotypes indicates that Early Cretaceous ornithurine birds were actually very diverse, compared to previous assumptions based on the body fossil record, which is dominated by enantiornithines.