medium · LSAT Logical Reasoning
A biologist concludes that a certain species of bird must be migratory because it is never seen in its nesting grounds during the winter months.
Which one of the following, if true, most weakens the biologist's conclusion?
- The species passes the winter dormant in deep underground burrows, where the birds cannot be observed.
- Reaching the species' nesting grounds in winter is extremely difficult for people because of heavy snow.
- The food the species relies on most is plentiful in the nesting grounds throughout the entire year.
- Other bird species sharing the same region are known to travel thousands of miles in their migrations.
- No member of the species has ever been observed anywhere on Earth during the winter months.
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