Sense Sonnet - Pumper

Hindsight

Yellow swallowtail butterflies
See with their genitals - do tell!
This does allow them to surmise
By seeing light how to do well.
When they mate, they do face away,
So to line up the male does use
His genital sight to display
The proper lineup for to dos.
These photo receptors allow
A high percent of success rate,
One good reason for better how
This butterfly species should mate.

In order to get mating right,
These butterflies do need hindsight.