Passage Summary: A bird expert claims a species isn't vegetarian because he watched them eat mostly bugs every morning for a few months.

Conclusion: The belief that this bird species primarily eats vegetation is incorrect.

Reasoning: Observations made every morning over several months showed that more than 50% of the birds' diet consisted of animal sources.

Analysis: The ornithologist is making a sweeping claim about the species' entire diet based on a very specific, limited window of observation. The flaw lies in the sampling: the expert only watched the birds in the morning. It is entirely possible that these birds have a high-protein breakfast of insects but spend the rest of the day grazing on plants. Look for an answer that highlights this potential lack of representativeness in the data collected.