Pupil size abnormalities can sometimes signal disease. 1  Glaucoma: A mid-dilated pupil can be a sign of glaucoma.  Aneurysm: An aneurysm that pushes on certain blood vessels in the brain can cause a dilated pupil as well as other symptoms.
Quick Answer. The total lifespan of a lightning bug is anywhere from one to two years. However, the bulk of that lifespan is spent underground in the larval phase. Adult lightning bugs have very short life spans, averaging just two months in the wild. Continue Reading.
Life Span of a Lightning Bug. There are more than 2,000 species of lightning bugs. Lightning bugs, also known as fireflies, belong to the insect family Lampyridae. Fireflies are not actually a type of fly; they are a species of beetle.