Polymorph does not grant you any of the extraordinary abilities of the new form. This has been clarified by the Sage.
Natural abilities are defined (in the PH and in the MM2) as abilities that aren't supernatural, spell-like or extraordinary. It would be impossible for an extraordinary ability to be a natural ability.
Constrict is included as an example of a natural weapon (which it is not), and this is fairly obviously an error. Rake is the name of a natural weapon as well as an extraordinary ability and while you get natural weapons you don't get extraordinary abilities. Low-light vision was used in the glossary description of natural abilities, and is either an exception or an error. (Most likely the later.)
All extraordinary abilities among the examples were removed in the latest errata concerning the polymorph effect (in the PsiH errata).
(The best way to handle polymorph is to stop focusing on what you don't get, and instead look at what you do get. If you change into a troll form you're not a troll minus some abilities. You're still "you", only with thicker skin, longer arms, bigger teeth and so on. )
Natural abilities are defined (in the PH and in the MM2) as abilities that aren't supernatural, spell-like or extraordinary. It would be impossible for an extraordinary ability to be a natural ability.
Constrict is included as an example of a natural weapon (which it is not), and this is fairly obviously an error. Rake is the name of a natural weapon as well as an extraordinary ability and while you get natural weapons you don't get extraordinary abilities. Low-light vision was used in the glossary description of natural abilities, and is either an exception or an error. (Most likely the later.)
All extraordinary abilities among the examples were removed in the latest errata concerning the polymorph effect (in the PsiH errata).
(The best way to handle polymorph is to stop focusing on what you don't get, and instead look at what you do get. If you change into a troll form you're not a troll minus some abilities. You're still "you", only with thicker skin, longer arms, bigger teeth and so on. )