text: Yo, check it out, I'm 'bout to drop some knowledge,
  'Bout the relationship between host and parasite in college.
  Specialization be the outcome, you see,
  From coevolution's long history.
  
  They coordinate their life cycles, it's tight,
  An arms race begins when they unite.
  Parasites be manipulative, that's they plan,
  Steinina ctenocephali livin' in the cat flea, man.
  
  In the alimentary canal, that's where they reside,
  Followin' phenology and metamorphosis, side by side.
  But the outcome of their partnership, we ain't clear,
  Mutualist, parasitic, or commensal, what's the deal here?
  
  To answer this question, we ran some tests,
  In lab conditions, we put it to the test.
  We measured flea life history, infection intensity in play,
  And here's what we found, let me relay.
  
  The emergence and survival rates, they stayed the same,
  No effect from gregarine infection, ain't that a game?
  But here's the twist, it's a surprise,
  Infected flea larvae developed faster, ain't no lies.
  
  They emerged earlier than the control group, you see,
  This gregarine got the power to modify host traits, it be.
  A protist with potential, a new model in sight,
  Evolutionary scenarios and control strategies, takin' flight.
  
  So remember this tale of host and parasite,
  Specialization and coevolution, takin' flight.
  With gregarines in the mix, things can change,
  A rap about science, ain't that kinda strange?