Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: What would be the best way to determine the role of squirrels in a forest ecosystem?
make field observations of squirrels in their natural habitat
Study their feeding habits, interactions with other species, and impact on tree populations.