Riddle me

[mrhpotter7]

this...? What's the pair of sisters who one eats the other and then gives birth to her so the other can eat the first and so on througout the centuries?
This is a riddle I am trying to figure out for an ORG.

 

[ZebraSpots]

i have no clue what ur talking about

 

[JennyEatWorld]

i have no clue... but isn't that, even theoretically, impossible?

 

[TERRY G]

Could it be the sun and the moon, sisters in the solar system as it drifts between night and day........

...Don't really know but the best I can come up with.

 

[iluvgoldie2]

what? i am totally confused.

 

[TreesRGreen]

Was this a dream you had? or a nightmare?
Perhaps a film you saw?

 

[NAB]

Sounds like it's from some mythology or something.

Here, I googled: http://www.ruthenia.ru/folklore/berezkin/eng/071_25.htm