Whistling as he breathes

Hi guys, I'm new to the forums here and I was wondering if you could offer some advice.

I have a rabbit, his name is Bryce and he's roughly 11 years old (He was adopted from P@h adoption centre and they told me he was 8 when we got him in '08). He's chilling out right now, looking half asleep as usual but as it's a very rare moment of peace and quiet at home, I can hear him whistling as he's breathing.
Do rabbits do this kind of thing? My grandparents have always had dogs, my cousin has a cat and I've owned rats in the past and I've never heard any of them whistling. It's like when us humans have something in our nose and causes a whistling as we breathe.
As Bryce is the first rabbit I've ever cared for and he is getting on a bit, I'm probably panicking over nothing, but I wanted to know if this is ok? I don't want to take him to the vet if it's just something that just happens, he hates the vet! In every other way he's perfectly normal too. I tried to quietly get closer to him to hear it a bit louder, but he heard me and it stopped.
I've never heard it before, but like I said, this is a rare moment of peace and quiet, so he could have done it before and I've not heard him over the normal household din!

I'd get him examined by a vet, he could have a respiratory tract infection or something along those lines.

Oompa-Loompa said:

I'd get him examined by a vet, he could have a respiratory tract infection or something along those lines.

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Oh dear, so rabbits don't normally do this? Respiratory problems are not good news, they are what took out my rats!

If he doesn't usually do it then yes I would get him checked by a vet. It's possible it's not a problem but it's not something most rabbits do.

Thanks for your advice, I'll definitely give the vet a call tomorrow. It's hard to say if he's done it before or not, there's normally a bit of background noise in our home!