Monarchs eyes are relatively very large and made up of thousands of ommatidia.  Each of which senses light and images.  The two antennae and the two palpi, which are densely covered with scales, sense molecules in the air and gives butterflies a sense of smell.  The proboscis on the other hand, is the butterfly's tongue.  This is where in which it sucks nectar and water for nourishment.  When the proboscis is not in use, then its curled up.

Monarchs have also four wings; two hindwings and two forewings.  Small structures attach the wings to the thorax, and muscles attached structures move the wings.  They move their wings by changing the shape of its thorax.  Wings, veins, tubes with thickened walls, contain trachea, nerves, and space for hemolymph to move through.  Veins give the wings structure, strength and support.  The monarchs veins are very exposable, thus indicating that the animal needs as much strength as possible because of long distant migration.

The abdomen has eleven segments, the last two or three of which are joined.  A pair of claspers on the end of the abdomen is found on the male monarch butterflies. These appendages are used for grasp during mating with the female