There's an old expression, "If it looks like a duck, swims like a duck, and quacks like a duck, then it's probably a duck." This expression is best understood as an example of which heuristic?

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The expression is an example of the representativeness heuristic, where we judge the probability of an event by finding a 'comparable known' event and assuming that the probabilities will be similar. In this case, if something has all the characteristics of a duck, we conclude it's probably a duck because it represents what we know about ducks.

There's an Old Expression, "If It Looks Like a Duck