2000

• Zimmer, J.K. & Whittaker, A. 2000. The Rufous Cacholote (Furnariidae: Pseudoseisura) is Two Species. The Condor 102(2): 409–422 DOI: 10.1093/condor/102.2.409 Reference page. 

2001

• Zimmer, K.J., A. Whittaker & D.C. Oren, 2001. A cryptic new species of flycatcher (Tyrannidae: Suiriri) from the Cerrado Region of Central South America. The Auk 118 (1): 56-78.Full article (PDF)Reference page. 

2002

• Zimmer, K.J. 2002. Species limits in Olive-backed Foliage-gleaner (Automolus: Furnariidae). The Wilson Bulletin 114(1): 20–37 DOI: 10.1676/0043-5643(2002)114[0020:SLIOBF]2.0.CO;2 Reference page. 

2003

• Zimmer, K.J. & Isler, M.L.. 2003. Family Thamnophilidae (typical antbirds). Pp. 448-681 in Handbook of the Birds of the World, Vol. 8. Broadbills to tapaculos. (J. del Hoyo et al., eds.). Lynx Edicions, Barcelona. Reference page. 

2005

• Robbins, M.B. & Zimmer, K.J. 2005. Taxonomy, vocalizations and natural history of Philydor dimidiatum (Furnariidae), with comments on the systematics of Syndactyla and Simoxenops. Bulletin of the British Ornithologist's Club 125, 212–228. Full text BHLReference page. 

2007

• Isler, M.L., Isler, P.R., Whitney, B.M. & Zimmer, K.J. 2007. Species limits in the "Schistocichla" complex of Percnostola antbirds (Passeriformes: Thamnophilidae). Wilson Journal of Ornithology 119: 53:70. DOI: 10.1676/05-121.1 Full article viewReference page. 

2008

• Zimmer, K.J. 2008. The White-eyed Foliage-gleaner (Furnariidae: Automolus) is two species. Wilson Journal of Ornithology 120: 10-25. DOI: 10.1676/06-167.1 Full article viewReference page. 

• Zimmer, K.J., Robbins, M.B. & Kopuchian, C. 2008. Taxonomy, vocalisations, syringeal morphology and natural history of Automolus roraimae (Furnariidae). Bulletin of the British Ornithologists' Club 128: 187-206. BHLReference page. 

2009

• Isler, M.L., Isler, P.R, Whitney, B.M., Zimmer, K.J. & Whittaker, A. 2009. Species limits in antbirds (Aves: Passeriformes: Thamnophilidae): an evaluation of Frederickena unduligera (Undulated Antshrike) based on vocalizations. Zootaxa, 2305: 61-68. Full article viewReference page. 

2013

• Zimmer, K. J.; Whittaker, A.; Sardelli, C.; Guilherme, and Aleixo, A. 2013. A new species of Hemitriccus tody-tyrant from the state of Acre, Brazil. In: J. del Hoyo, A. Elliott e D. Christie. (Org.). Handbook of the Birds of the World, Special Volume: New Species and Global Index. 1ed. Barcelona: Lynx Edicions, 292-296. Full article (pdf)Reference page. 

2014

• Kirwan, G.M., Steinheimer, F.D., Raposo, M.A. & Zimmer, K.J. 2014: Nomenclatural corrections, neotype designation and new subspecies description in the genus Suiriri (Aves: Passeriformes: Tyrannidae). Zootaxa 3784(3): 224–240. DOI: 10.11646/zootaxa.3784.3.2 Full article viewReference page. 

2015

• Benz, B.W., Robbins, M.B. & Zimmer, K.J. 2015. Phylogenetic relationships of the Helmeted Woodpecker (Dryocopus galeatus): A case of interspecific mimicry? Auk 132:939-950. Full article (PDF)Reference page.