CCspec: Corncrake, _Crex crex_ - spectrum properties
In IDmeasurer: Assessment of Individual Identity in Animal Signals

Species: Corncrake, Crex crex
Number of individuals: 33
Number of calls per individual: 10
Number of acoustic variables: 7
Individual identity: HS=5.68
Reference: Budka, M., & Osiejuk, T. S. (2013). Formant Frequencies are Acoustic Cues to Caller Discrimination and are a Weak Indicator of the Body Size of Corncrake Males. Ethology, 119, 960-969. doi:10.1111/eth.12141

Corncrake calls were recorded at three sites in Poland and one in the Czech Republic Recordings were made during the corncrake breeding season, from 8 to 30 July, in 2011 and in 2012. Males were recorded when calling spontaneously, in favourable conditions, at night (from 22.00 to 03.30, local time) from a distance of ca. 5-10 m. The original dataset comprised 104 males with 10 calls measured from each male.

Seven variables were selected to measure duration of the first syllable of the call and its basic spectral parameters of each first syllable of the call like the peak frequency, distribution of frequency amplitudes within spectrum, and range of the frequencies (minimum and maximum). Additionally, the duration of the call was measured. Variables were extracted in SASLab Pro by Avisoft.

CCspec

A data frame with 330 rows and 8 variables:

id: factor, identity code of an individual emitting the call
dur: duration of the call, in seconds
df: frequency of maximum amplitude within the spectrum - peak frequency, in Hertz
minf, maxf: minimum and maximum fequency at -25dB relative to the call peak amplitude, in Hertz
q25, q50, q75: frequencies at the three quartiles of amplitude distribution; frequencies below which lie 25, 50 and 75 percent of the energy of the call, respectively, in Hertz