Forest butterflies are often brown. this them to
a. find nectar
b. keep warm
c. aviod the need to hibernate
d. avoid predators

d.avoid predators

Explanation:

Organisms often mimic their surroundings to escape the predators. This technique is also called as camouflaging.

Forest butterflies have also adopted several structural adaptations to avoid predators. Many of them have brown wings with jagged edges so that they resemble dried leaves. In this way they blend with their surroundings, specially the forest floor and go unnoticed. On other hand butterfly larvae are green in color so that they resemble the leaves on which they feed and avoid predators.

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