Neville's role/Canary-in-the-mine

[brewpub44]

No: HPFGUIDX 32794

--- In HPforGrownups at y..., "grey_wolf_c" <greywolf1 at j...> wrote:
> Going a bit off-topic, though, I always had doubts 
> about the whole canary-in-the-mine theory. It was suposed to die 
> because of soffocation? The smaller a creature is, the less air it 
> needs, and the calmer you are, the less air you need. Why would, 
then, 
> the canary (small, virtually inmobile inside is cage) die sooner 
than 
> the miners (big men, sweating away while mining)? But I digress...
> 
> Hope that helped,
> 
> Grey Wolf


Actually, it's the poison gasses the canary is detecting. It would 
react much quicker than a man. They'd all probably die at the same 
time if air simply ran out.

Now, to be totally stupid: where does Neville turn into a canary? I 
read all four books, twice, and don't remember that at all! Someone 
help me out!

A Barkeep in Diagon Alley