Buried terminal nesting chamber of a ground squirrel burrow. Note the supply of seeds. Duvannyy Yar.  
  Part of: Malavin S, Shmakova L, Claverie J-M, Rivkina E (2020) Frozen Zoo: a collection of permafrost samples containing viable protists and their viruses. Biodiversity Data Journal 8: e51586. https://doi.org/10.3897/BDJ.8.e51586