Darlingtonia 'Fangs'.

[NeciFiX]

Yup, what defines the Darlingtonia is it's fangs or 'moustache' *depending which walk of life you come from*.

But, what exactly are they for? To block out light so the prey can't easily get out? Or what?

What are these fangs for? Are they the nectar source?

I could never figure this one out. Could someone please enlighten me? The plant certaintly has them for SOME reason.

 

[FarmerDave]

I believe that they are one of the main attractant for the prey as well as a landing pad and a 'navagation area'

 

[Not a Number]

Dave is right. The fangs/moustache/tongue/fish-tail are often brightly colored red and have nectar trails leading to the opening.

Sarracenia typically have a nectar trail on the ala (the 'keel' on the pitcher tube) that leads to the peristome opening.