Russia , Lapland - September 18, 2016: Field scientific research. Ringing birds as method to study migrations and population. Ornithologist aging oxeye (Parus major), equipment on table

Russia , Lapland - September 18, 2016: Field scientific research. Ringing birds as method to study migrations and population. Ornithologist aging oxeye (Parus major), equipment on table - 116110821