Knut Eisermann contributes to the collection and analyses of bird sounds of Guatemala.
An analysis of territorial toot calls of Guatemalan Pygmy-Owl Glaucidium cobanense in the highlands of southern Mexico (south of the isthmus of Tehuantepec) and northern Central America and Mountain Pygmy-Owl Glaucidium gnoma in the Mexican highlands north of the isthmus of Tehuantepec supports the specific separation of both taxa.
Eisermann, K. & S. N. G. Howell. 2011. Vocalizations of the Guatemalan Pygmy-Owl (Glaucidium cobanense). Journal of Raptor Research 45: 304-314. more
Vocalizations of Unspotted Saw-whet Owl Aegolius ridgwayi were described from the Guatemalan highlands.
Eisermann, K. (2013) Vocal field marks of Unspotted Saw-whet Owl and Guatemalan Pygmy-Owl. Neotropical Birding 13: 8-13. more
A comprehensive natural history of the Highland Guan (Eisermann, K. 2012. Highland Guan (Penelopina nigra), Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY.) includes a detailed description of sounds produced by this cracid endemic to the highlands of northern Central America and southern Mexico. more
Previously undescribed vocalizations of Azure-rumped Tanager Poecilostreptus cabanisi, endemic to the Pacific slope of southern Mexico and Guatemala, were described in Eisermann, K., G. López, J. Berry, J. de León Lux & A. Burge (2011) Vocalisations and juvenile plumage of the Azure-rumped Tanager. Cotinga 33: 23-26. more
First documentation of the song of the endemic subspecies of Savannah Sparrow Passerculus sandwichensis wetmorei in: Eisermann, K., C. Avendaño & E. Matías. 2017. Nesting evidence, density and vocalisations in a resident population of Savannah Sparrow Passerculus sandwichensis wetmorei in Guatemala. Bulletin of the British Ornithologists' Club 137: 37-45. more
Voucher recordings supporting these publications were archived at the Macaulay Library of Natural Sounds (Cornell Lab of Ornithology) and at xeno-canto.