[HPforGrownups] Why a swan Patronus?

[Vivamus]

No: HPFGUIDX 124000

> Casil wrote (in small part):
> 
> > The question that has been going through my mind since reading the 
> > Patronus part of OotP is why on earth is Cho's Patronus a 
> swan of all 
> > things?
> 
> Now Tammy Rizzo says:
> 
> Well, that's easy.  Have you ever wandered too near a swan's 
> nest?  Those suckers are MEAN!  They hiss, they batter at you 
> with their VERY strong wings, they peck and leave awful 
> bruises, they BITE and can not only break the skin but can 
> actually take pieces of flesh, and they don't give up their 
> territory!  They fight until YOU back off, or you kill them.  
> Swans are MEAN beasts!  They are, if this is possible, meaner 
> than geese, though swans, since they don't hang out in groups 
> like geese do, might not be AS *dangerous* as geese (who are 
> generally somewhat smaller than swans but have numbers in 
> their favor most times).  It didn't surprise me at all to 
> find that Cho's Patronus was a swan.  Or, well, that 
> SOMEONE'S Patronus was a swan, at least.  Oh, wait.  Were you 
> asking why ANYONE had a swan Patronus, or why CHO had one?

Vivamus:
Cho's patronus is a swan:  

'Oh, don't be such a killjoy,' said Cho brightly, watching her silvery
swan-shaped Patronus soar around the Room of Requirement during their last
lesson before Easter. They're so pretty!'