I have some random questions.
Are there any limits on what kind of creature your Animagus or Patronus assumes? Do either have to be mundane animals like owls and deers and dogs, or could magical animals be used as well? Could a wizard conceivably have a dragon Patronus, or could someone's Animagus form be a Hippogryff or something?
What about extinct creatures? Could some dinosaur-obsessed paleontologist who happened to be a wizard have a Tyrannosaurus Rex as a Patronus? What about dinosaurs as Animagus forms?
Lastly, do you think there are any limitations on the size of a Patronus? Could someone have a blue whale as a Patronus, or is that too big?
Tim the Enchanter