Write a mythology.
Possible idea: Why do giraffes have long necks and no voice, and what are those funny horn bobs for?
Possible idea #2: Why do mother cats carry their young by the neck?
Possible idea #3: Why do male sea horses carry the eggs to maturity and not the females?
There are scientific explanations for all of these. Come up with a mythological reason for your choice of biological mystery.
