An investigation to determine the feeding habits of a species of bird
employs the use of observational data obtained outside of a laboratory.
Observational data outside of a laboratory is best suited for feeding habits
of a bird because it requires lower degree of control over the environment.
Feeding pattern doesn't require any special technique which is why it can be
done on the field.
Other options require the use of higher degree of control over the
environment to ensure accurate results are derived.
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