Funding for this research was provided by:
Forest Fund Poland (OR.222.214.171.1247)
Received: 27 July 2020
Accepted: 3 June 2021
First Online: 10 June 2021
: This study did not require official or institutional ethical approval. The animals were handled according to high ethical standards and national legislation.
: Not applicable.
: The authors declare that they have no competing interests.