Diet of breeding Tengmalm’s Owls Aegolius funereus: long-term changes and year-to-year variation under cyclic food conditions

The diet of breeding Tengmalm’s Owl , A. funereus was studied in the Kauhava region, west Finland, using two methods: identification of prey animals cached in the
nest-holes(a total of 4366 prey items in 1973-86) and found in the pellets and orher prey remains colletred from de nest-holes (12540 in 1966-86).

Erkki Korpimaki, Ornis Fennica 65:21-30