Roland Frey
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View article: Roars, groans and moans: Anatomical correlates of vocal diversity in polygynous deer
Roars, groans and moans: Anatomical correlates of vocal diversity in polygynous deer Open
Eurasian deer are characterized by the extraordinary diversity of their vocal repertoires. Male sexual calls range from roars with relatively low fundamental frequency (hereafter f o ) in red deer Cervus elaphus , to moans with extremely h…
View article: Simulations of fallow deer groans from CT scanned vocal tracts
Simulations of fallow deer groans from CT scanned vocal tracts Open
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View article: Savannah roars: The vocal anatomy and the impressive rutting calls of male impala (<i>Aepyceros melampus</i>) – highlighting the acoustic correlates of a mobile larynx
Savannah roars: The vocal anatomy and the impressive rutting calls of male impala (<i>Aepyceros melampus</i>) – highlighting the acoustic correlates of a mobile larynx Open
A retractable larynx and adaptations of the vocal folds in the males of several polygynous ruminants serve for the production of rutting calls that acoustically announce larger than actual body size to both rival males and potential female…
View article: The remarkable vocal anatomy of the koala (<i>Phascolarctos cinereus</i>): insights into low‐frequency sound production in a marsupial species
The remarkable vocal anatomy of the koala (<i>Phascolarctos cinereus</i>): insights into low‐frequency sound production in a marsupial species Open
Koalas are characterised by a highly unusual vocal anatomy, with a descended larynx and velar vocal folds, allowing them to produce calls at disproportionately low frequencies. Here we use advanced imaging techniques, histological data, cl…
View article: Hiss and snort call types of wild-living giraffes Giraffa camelopardalis: acoustic structure and context
Hiss and snort call types of wild-living giraffes Giraffa camelopardalis: acoustic structure and context Open
The hiss and snort calls were emitted during five recording sessions produced by nine individual giraffes (8 adults and 1 subadult) in their natural environment in Namibia (3 individuals) and Kenya (6 individuals). These calls attended vig…
View article: Vocal tract modelling in fallow deer: are male groans nasalized?
Vocal tract modelling in fallow deer: are male groans nasalized? Open
Males of several species of deer have a descended and mobile larynx, resulting in an unusually long vocal tract, which can be further extended by lowering the larynx during call production. Formant frequencies are lowered as the vocal trac…
View article: MOESM2 of Hiss and snort call types of wild-living giraffes Giraffa camelopardalis: acoustic structure and context
MOESM2 of Hiss and snort call types of wild-living giraffes Giraffa camelopardalis: acoustic structure and context Open
Additional file 2: Table S1. Table with acoustic measurements of giraffe hisses and snorts for describing the acoustic features of these two call types.
View article: Bull bellows and bugles: a remarkable convergence of low and high-frequency vocalizations between male domestic cattle <i>Bos taurus</i> and the rutting calls of Siberian and North American wapiti
Bull bellows and bugles: a remarkable convergence of low and high-frequency vocalizations between male domestic cattle <i>Bos taurus</i> and the rutting calls of Siberian and North American wapiti Open
Whereas low-frequency bellows (below 200 Hz) have been investigated in detail in both male and female domestic cattle (Bos taurus), male high-frequency bugle calls (over 800 Hz) have not been described so far in any large bovid species. In…
View article: Evidence of biphonation and source–filter interactions in the bugles of male North American wapiti (<i>Cervus canadensis</i>)
Evidence of biphonation and source–filter interactions in the bugles of male North American wapiti (<i>Cervus canadensis</i>) Open
With an average male body mass of 320 kg, the wapiti, Cervus canadensis, is the largest extant species of Old World deer (Cervinae). Despite this large body size, male wapiti produce whistle-like sexual calls called bugles characterised by…
View article: Potential Sources of High Frequency and Biphonic Vocalization in the Dhole (Cuon alpinus)
Potential Sources of High Frequency and Biphonic Vocalization in the Dhole (Cuon alpinus) Open
Biphonation, i.e. two independent fundamental frequencies in a call spectrum, is a prominent feature of vocal activity in dog-like canids. Dog-like canids can produce a low (f0) and a high (g0) fundamental frequency simultaneously. In cont…