Here's a particularly interesting page from this section, as it appears in the original score:
(Remember, you can blow any of these images up to a more readable size by clicking on them.)
And this is what the introduction sounds like, starting from several measures prior to the above and extending to the end of the section: Rite of Spring -- Introduction.
Here's a transcription, by Nicolas England, of a Ju'hoansi Bushmen song for comparison:
The similarities I perceive may not be obvious, but in my next post I'll be going into a more detailed analysis of both examples that should make things a bit clearer. Meanwhile I'll leave you to ponder the meaning of the title Stravinsky originally gave to this section. It's a Russian word: Dudki.