Wildfowl communities and their foraging behaviors were investigated from November 2021 to April 2022 in Sakurada moat of the Imperial Palace, Tokyo, where submerged aquatic vegetation Eurasian watermilfoil Myriophyllum spicatum was growing. Wildfowl communities consisting mainly of phytophagous birds whose main food was Eurasian watermilfoil, were dominant in the moat in August 2021. Nearly 100 Eurasian Coots Fulica atra were seen, actively diving to forage and emerging with rooted milfoil stems in their bills. The leeward part of the water surface was covered with milfoil stumps, and the submerged aquatic vegetation that was dominant in Sakurada moat in September 2022 was Potamogeton pusillus. These phenomena may have been influenced by the feeding behavior of waterfowl.
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