Picture of 2 of the 4 adaptation enclosures in Vrachanski Balkan NP.

 
 
  Part of: Koshev Y, Kachamakova M, Arangelov S, Ragyov D (2019) Translocations of European ground squirrel (Spermophilus citellus) along altitudinal gradient in Bulgaria – an overview. Nature Conservation 35: 63-95. https://doi.org/10.3897/natureconservation.35.30911