A shift in thought can be indicated by what is called an em dash. An em dash is used to set of an interruption that is closely relevant to
the sentence but is not grammatically part of it. These set of
interruptions can be found in a list, illustration, restatement, shift
in thought or tone, summary, or dramatic point.
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The herbivorous duck would be the primary consumer. In a food web, these are the creatures that directly eat plants and vegetation. Secondary and tertiary consumers, which would be the osprey and bald eagle in this case, are the creatures that directly eat the primary consumers.
