Morales A*, Frei B, Mitchell GW, Begin Marchand C, Elliott KH. In review. Molt migrating Swainson's thrush trade time for energy during fall migration. Behavioural Ecology.
 Brennan CL, Boulanger E, Duval S, Frei B, Gorbet A, Head J, Shieldcastle M, Jones AW. In review. Two cases of a previously undocumented New World warbler hybrid (Setophaga magnolia x S. ruticilla) in eastern North America. Wilson's Journal of Ornithology
 Frei B, Queiroz C, Chaplin-Kramer R, Andersson E, Renard D, Rhemtulla JM, Bennett EM. In review. A brighter future for agricultural landscapes: diversity as a feature of resilience. Global Food Security.
 Morales A*, Frei B, Leung C*, Titman R, Whelan S, Benowitz-Fredericks ZM, Elliott KH. 2020.Point-of-care blood analyzers measure the nutritional state of eighteen free-living bird species. Comparative Biochemistry and Physiology, Part A. https://doi.org/10.1016/j.cbpa.2019.110594  Garra J*, Frei B, Bennett E.M 2019. Bright spots among lakes in the Rideau Valley Watershed, Ontario. Ecology and Society 24 (3):22. [online] URL:https://www.ecologyandsociety.org/vol24/iss3/art22/
 Nip EJ*, Frei B, Elliott KH. 2018. Temporal variation in body mass and fat stores in Black-capped Chickadees (Poecile atricapillus). Canadian Field-Naturalist.
 Frei B, Renard D, Mitchell MGE, Seufert V, Chaplin-Kramer R, Rhemtulla JM, Bennett EM. 2018. Bright spots in agricultural landscapes: Identifying areas exceeding expectations for multifunctionality and biodiversity. Journal of Applied Ecology. (Link)
 Frei B, Bennett EM, Kerr JT. 2018. Agricultural land-use intensity strongest predictor of avian biodiversity loss in agroecosystems with a long history of agriculture. Regional Environmental Change. (Link)
 Jarjour C*, Frei B, Elliott KH. 2017.Associations between sex, age and species-specific climate sensitivity in migration. Animal Migration.
 Frei B, Fyles J, Berl JL, Edwards JW, Nocera JJ. 2015. Low fecundity of Red-headed Woodpeckers at the northern edge of the range. Wilson Journal of Ornithology. 127: 639-645.
 Frei B, Smith KG, Withgott JH, Rodewald PG. 2015. Red-headed Woodpecker (Melanerpeserythrocephalus), The Birds of North America Online (A. Poole, Ed.). Ithaca, Cornell Lab of Ornithology .  Frei B, Nocera JJ, Fyles J. 2015. Interference competition and nest survival of the threatened Red-headed Woodpecker. Journal of Ornithology. 156:743–753.
 Frei B, Fyles J, Nocera JJ. 2013. Maladaptive habitat use of a North American woodpecker in population decline. Ethology 119: 377-388.
 Guedes RNC, Matheson SM, Frei B, Smith ML, Yack JE. 2012. Vibrational detection and discrimination in the masked birch caterpillar (Drepana arcuata). Journal of Comparative Physiology A 198: 325-335.
 Frei B, Bird DM, Titman RD. 2010. Bobolink egg mass variability and nestling growth patterns. Wilson Journal of Ornithology 122: 432-438.
 Hudson MA, Gahbauer M, Leckie S, Frei B. 2008. Unusually Extensive Preformative Molt in Hatching-year Song Sparrows. North American Bird Bander 33: 1-6.
* Supervised student
Technical reports and other publications
Frei B. In progress. COSEWIC Assessment and Update Status Report on the Red-headed Woodpecker (Melanerpes erythrocephalus). Committee on the Status of Endangered Wildlife in Canada, Ottawa.
Frei B. 2014. Have you seen the Redhead? Ontario Nature.
Howes L-A, Frei B. 2013. North American Banding Council Manual to Banding at Nest Boxes. North American Banding Council. 35 pp.
McCracken JD, Reid RA, Renfrew RB, Frei B, Jalava JV, Cowie A, Couturier AR. 2013. DRAFT Recovery Strategy for the Bobolink (Dolichonyx oryzivorus) and Eastern Meadowlark (Sturnella magna) in Ontario. Ontario Recovery Strategy Series. Prepared for the Ontario Ministry of Natural Resources, Peterborough, Ontario. viii + 86 pp.
Frei B. 2014. Roles of maladaptive behaviour and evolutionary traps in the decline of a threatened woodpecker. Ph.D. Dissertation, McGill University, Montréal, QC. 170 pp.
Frei B. 2011. Ontario’s Threatened Bobolink. Ontario Field Ornithologists 29(3): 9-10.
Frei B. 2011. Researching Ontario’s Red-headed Woodpeckers. Ontario Field Ornithologists 29(1): 8-9.
Frei B, Hudson M-A R. 2008. McGill Bird Observatory Fall Migration Monitoring Program 2007 Report. McGill Bird Observatory, Montreal, Quebec. Available at: http://www.migrationresearch.org/documents/fmmp2008.pdf
Hudson M-A R, Frei B. 2007. McGill Bird Observatory Spring Migration Monitoring Program 2007 Report. McGill Bird Observatory, Montreal, Quebec. Available at: http://www.migrationresearch.org/mbo/reports/fmmp2007.pdf
Frei B. 2009. Environmental review report for the Wolfe Island wind project. www.waterkeepers.ca/documents/2009-03_FREI.pdf Frei B. 2008. Étude Sur l’Écologie du Goglu des Prés: Ecological Study of Bobolinks. Canadian Wildlife Service Technical Report, Environment Canada. 25 pgs
Frei B, Bennett E, Kerr J. 2015. Conserving biodiversity in Canada's agroecosystems: are we forest-focused and forgetting farmland? Canadian Society for Ecology and Evolution, Saskatoon, SK, Canada.
Frei B, Fyles J, Nocera JJ. 2013. Missing the small picture: What is a global model hiding in the story of the Red-headed Woodpecker’s decline? Society for Canadian Ornithologists, Winnipeg, MB. *Invited symposium
Frei B, Nocera JJ, Fyles J. 2013. The early bird gets the competition: Invasive species lowers breeding success of a threatened woodpecker. Canadian Society for Ecology and Evolution, Kelowna, BC, Canada. *Best talk award
Frei B, Fyles J, Nocera JJ. 2012. Red-headed Woodpeckers exhibit non-ideal habitat selection in a human- modified landscape. North American Ornithological Conference V, Vancouver, BC, Canada.
Frei B, Fyles J, Nocera JJ. 2012. A threatened woodpecker makes bad choices in a rapidly changing world. Symposium on Biodiversity Science. Québec Centre for Biodiversity Science. Montréal, Coeur de science, QC, Canada. Frei B, Fyles J, Nocera JJ. 2012. Red-headed Woodpecker maladaptive habitat use and competition at the northern edge of their range. Société Québecoise pour l’étude Biologique du Comportement. Université de Montréal, Montréal, QC, Canada.