Scales appear as flat, thin over-lapping structures. We will observe them under the microscope during lab. All butterflies have 2 pair of wings and all are invertebrates meaning they do not have a back bone. Butterflies see through a pair of compound eyes. Each eye consists of about 6,000 lenses.
Butterflies breathe through a series of tubes called spiracles.
They do not have lungs. Two antennae on their head to smell chemicals. Being able to smell is very important to butterflies for locating food and mates. This is also important to female butterflies seeking specific plants on which to lay their eggs. Butterflies have a substance called haemolymph but they do not have a heart to pump it with.