Finnish owls’ lives, new book

This video says about itself:

TENGMALM´S OWL, Finland

TENGMALM´S OWL, Aegolius funereus, Helmipöllö, Ylämaa Leino, 28.5.2009

From British Birds:

Moult, ageing and sexing of Finnish owls

Published on 05 January 2015 in Book reviews

By Heimo Mikkola and Jouni Lamminmäki

The Ornithological Society of Suomenselkä, Saarijärvi, 2014; pbk, 96pp; photographs and line-drawings

ISBN 978-951-98263-1-8 Subbuteo code M24340 £17.50

Until now, accurate data on the moult of European owls has been somewhat fragmented. This handbook brings together all current knowledge available on the moult, age and sex determination of the 13 species of European owl. The book begins with a useful glossary of terms and abbreviations used in the tables and throughout the text. It is followed by a general overview of moult and its use in ageing and sexing, and aspects such as the process and sequences of moult, how moult varies between species…