Red Crossbill, percna subspecies
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Groth, J.G. 1993. Evolutionary differentiation in morphology, vocalizations, and allozymes among nomadic sibling species in the North American Red Crossbill (Loxia curvirostra) complex. University of California Publications in Zoology 127: 1–143.
Helle, P. 1985. Effects of forest fragmentation on bird densities in northern boreal forests. Ornis Fennica 62: 35-41
Marquiss, M. and R. Rae. 1994. Seasonal trends in abundance, diet and breeding of Common Crossbills (Loxia curvirostra) in an area of mixed species conifer plantation following the 1990 crossbill “irruption.” Forestry 67: 32–45.
Marquiss, M. and R. Rae. 2002. Ecological differentiation in relation to bill size amongst sympatric, genetically undifferentiated crossbills Loxia spp. Ibis 144: 494–508.
Parchman, T.L. and C.W. Benkman. 2002. Diversifying coevolution between crossbills and black spruce on Newfoundland. Evolution 56: 1663–1672.
Payne, R.B. 1972. Nuts, bones, and a nesting of Red Crossbills in the Panamint Mountains, California. Condor 74: 485–486.
Peters, H.S. and T.D. Burleigh. 1951. The birds of Newfoundland. Newfoundland Department of Natural Resources, St. John’s, Newfoundland.
Smith, J.W., C.W. Benkman, and K. Coffey. 1999. The use and misuse of public information by foraging Red Crossbills. Behavioral Ecology 10: 54–62.
Summers, R.W. and R. Proctor. 1999. Tree and cone selection by crossbills Loxia sp. and Red Squirrels (Sciurus vulgaris) at Abernethy forest Strathspey. For. Ecol. Manage. 118: 173-182
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Wren, L.S. 2001. Continental and regional distribution and abundance patterns of boreal cardueline finches: Influences of conifer seed availability. M.Sc. thesis, Memorial University of Newfoundland, St. John’s, Newfoundland and Labrador.
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