First Online: 26 February 2019
Ethics approval and consent to participate
: During this work, I adhered to the ‘Guidelines for the treatment of animals in behavioral research and teaching’, published by the Animal Behavior Society [CitationRef removed], and to the laws on animal welfare for scientific research of the Russian Federation, where the study was conducted. A.N. Severtsov Institute of Ecology and Evolution provided full approval for this purely observational research.
: Not applicable.
: The author declare that she has no competing interests.
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