The giving-up density (GUD) of gray squirrels feeding on college campuses tends to be higher than that of squirrels feeding in suburban back yards. Which of the following hypotheses is consistent with this result?
a. Squirrels perceive predation risk to be higher in suburban back yards.
b. Squirrels perceive predation risk to be higher on college campuses.
c. Squirrels are better fed in suburban back yards, and thus feed less intensively.
d. Squirrels benefit less by foraging in suburban back yards than on college campuses.
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