The scant information about the oropharyngeal cavity floor of the newly hatched Muscovy duck (Cairina moschata) and domestic duck (Anas platyrhynchos domesticus) encouraged us to perform the first comparative anatomical features of their oropharyngeal cavity floors (lower beak, tongue, laryngeal entrance) to provide a comprehensive comparative view of their feeding filtering apparatus using scanning electron microscopy. Both species share features, including the round apex with its small, spatula-like nail, lingual comb, lingual sulcus, and laryngeal mound. At the same time, there are certain characteristic differences between their oropharyngeal cavity floors. The teeth-like papillary region of the domestic duck had teeth-like papillae arranged in 3 or 4 rows in the median area and 2 or 3 rows in the lateral region. Each median papilla is surrounded by 4-6 layers, while 1 or 2 layers surround each lateral papilla. In contrast, the Muscovy duck had a similar region that contained numerous papillae arranged in 3 or 4 rows in the median region and 2 or 3 rows laterally. Each papilla in the Muscovy duck consists of 6-7 layers, while the lateral papillae are surrounded by 2-3 layers. The dorsal row of the papillary crest carried 14-16 papillae in both ducks, while in the domestic duck, the ventral row had 6-8 small papillae, while in the Muscovy duck, it carried 8-10 papillae. In the Muscovy duck, the lingual root carried three oblique papillary rows on each lateral portion of its dorsal surface.