Assertion: mallard's foot | /r/HasProperty | 30 cm
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Source sentences:
text: If they are given access to a pond, they dabble in the mud, dredging out and eating wildlife and frog spawn, and swallow adult frogs and toads up to the size of the common frog Rana temporaria, as they have been bred to be much bigger than wild ducks, with a waterline length (base of neck to base of tail) of up to 1 foot (30 cm); the wild mallard's waterline length is about 6 inches (15 cm).