Insect sex and homosexuality
This bug is called a blood-sucking cone nose. It spreads a parasite that causes a tropical disease referred to as Chagas' disease.
When examining a jar filled with adult male insects, a student observed that the males were trying to copulate (have sex) with each other, and wondered if their feable attempt at homosexuality (their parts just don't fit together) was part of our 'fallen' world.
No, I thought, these insects are simply not too bright. They don't have much of a brain.