B.-G. Carlsson, B. Hörnfeldt; Determination of Nestling Age and Laying Date in Tengmalm’s Owl: Use of Wing Length and Body Mass, The Condor: Ornithological
No takes yet. Share an insight, caveat, or question.
Carlsson et al. (1994) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: