It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
This is what The Birder's Handbook says about mallard feeding:
DIET: Seeds and shoots of sedge, grass, and aquatic vegetation, grain,
acorns; insects, aquatic invertebrates. Laying females may eat 2 times more
animal food than males or non-laying females.