Continuous monitoring of population size and distribution is crucial for conservation and effective management of any species, but is often difficult to maintain, especially for elusive species like the grey wolf. Many forget on the importance of collecting data on the field. Large wolf populated areas are difficult and expensive to monitor. Collaboration with and interested and inclusion of trained volunteers is sometimes used highly recommended to improve coverage of study research area., athough However, data informations collected, should be accepted interpreted with precaution and regular training of volunteers is highly recommended. In Slovenia wolf presence population was monitored during the years 2010-2013 was assessed by through a sign and vocal survey conducted by volunteers and professional biologists. Sampling approach was designed to collect data and 2429 volunteers were included in wolf surveillance activities in Slovenia. 732 volunteers attended educational seminars, 453 took part at in winter snow trackings and 190 were included in summer wolf howling monitoring. With participation of large numbers of trained volunteers, it was possible to monitor an area up to 3384 km2 in one day. In winter minimum of 171 km of wolf tracks were followed, 12 wolf prey remiands and 185 genetic samples were found, importantly contributing to results of genetic analyses. Together with data collected by researchers and Slovenian Forest Service, the estimation of wolf population size, number of packs, distribution, and effective population size was done.