Mantled howler monkeys have been found to obtain most of their food from relatively rare trees, even though finding these trees takes much longer than finding common trees. Nutritional analyses of both rare and common trees found that the rare trees tended to be higher in protein and water, while the common trees tended to be higher in crude fiber and plant secondary compounds. What process would maintain this behavior in mantled howler monkey populations?
A. habituation
B. imprinting
C. natural selection
D. sexual selection
E. visual communication
Answer: C
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