Female Corncrake(Crex crex) singing in the wild

@article{Ottvall2005FemaleCC,
  title={Female Corncrake(Crex crex) singing in the wild},
  author={Richard Ottvall},
  journal={Journal f{\"u}r Ornithologie},
  year={2005},
  volume={140},
  pages={453-456}
}
  • R. Ottvall
  • Published 1 October 1999
  • Biology
  • Journal für Ornithologie
The male Corncrake (Crex crex) has a characteristic mating call. In aviary it has been shown that females can also produce a call similar to the male's typical “crex crex”. I describe a strikingly different call produced by a female on Öland, southeast Sweden. The sex identification was based on the small size during close examination in the hand. The female call has a similar rhythm to the male call but lacks the rasping of the male and is almost a barking sound. The female was heard calling… 
Effects of season, plasma testosterone and body size on corncrake (Crex crex) call rhythm
TLDR
It is suggested that call rhythm is a conventional signal of aggressive motivation, with receiver retaliation as a possible stabilizing cost in corncrake males with larger body size.
The increase in the Corncrake Crex crex population of the United Kingdom has slowed
Capsule The UK Corncrake population increase has slowed, but has rapidly recovered from a large decline in 2013. Aims To provide an update on the population size and distribution of breeding

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