WHAT PURPOSE DOES THE VICEROY BUTTERFLY MIMICRY OF THE MONARCH BUTTERFLY SERVE?

Monarch caterpillar
on a milk plant
Monarch caterpillar on a milk plant
Monarch butterfly
Monarch butterfly

Although usually smaller, the viceroy butterfly is identical to the monarch butterfly in design, apart from the black inner line on the lower wings of the viceroy. The viceroy feeds on willow, aspen and poplar leaves that are non-poisonous. In contrast, the monarch feeds on toxic milkweed leaves and turns the noxious chemicals therein into weapons against birds.

Viceroy on a grape myrtle
Viceroy on a grape myrtle
viceroy caterpillar on a willow
viceroy caterpillar on a willow

Researchers believe the viceroy mimics the monarch, which is offensive and poisonous to birds, to ward off predators. However, according to eReferenceDesk, recent research has shown that viceroy butterflies develop their toxic chemicals to keep birds at bay. The monarch and viceroy butterflies are, thus, inherently poisonous and birds stay clear of both.

N72_Butterfly_8
N72_Butterfly_9

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