found: Work cat.: Grubb, T.C. Ptilochronology, 2006:back cover (interpretation of feather growth rates as an index of nutritional condition in birds; author has coined term ptilochronology, literally "the study of feather time") pref.(an analytical technique in avian biology)
found: Wiktionary, 7 Sept. 2006(ptilochronology: literally "the study of feather time", coined by Thomas C. Grubb Jr. to describe the study of feather growth rates as an index of nutritional condition in birds)
found: J. Field Ornithol.:vol. 74, no.2 (2003) p. 125 (ptilochronology, or use of feather growth bars as an index of nutritional condition, has been used extensively since Grubb introduced the concept)
