The European Bison is the largest land-based mammal in the continent (a mature specimen could reach up to two meters high and weigh a ton). These animals actively manages the landscape; they have a varied range of feeding with a diet based in lignin (wood fiber), which includes 120 vegetal species; indirectly favors other species that inhabit pasture ecosystems, also as a protein reservoir for predators and scavengers. 

Recent European bison are the descendants of 13 animals, representing a recombination of only 12 diploid sets of genes; two genetic lines consecuently, Lowland and Lowland-Caucasian.
The European bison (B.bonasus) is generally located in small and restricted areas, where the concentration of individuals is too high, resulting low genetic diversity and high susceptibility to diseases.

The restitution project would aim to improve the attitude of local communities towards the European bison and its expansion to new areas through better information and educational activities. 

Formerly European bison domains reached Western Asia, but it was disappearing as a result of massive hunting, intensive logging and the clearing of forests for agriculture and grazing, reducing the original habitat of these animals.
As part of the restitution project, a set of different management actions were implemented in order to improve bison dispersal in different areas: meadows, small water reservoirs, wild fruit trees and feeding sites. 

The European Bison Genetic Data Bank has created by species variability preservation.

The bison population had increased by 13.6% since 2005, the total area covered by the whole population had increased by 32%.

The main center of the restituton project is in the forest of Białowieża, in Poland. The International Bison Defense Company (CIDB) works on recovery of this species since the 50s.