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have been culling

  • present perfect progressive
    of cull.
    cull
    verb (used with object)
    to select and remove from a group, especially to discard or destroy as inferior.

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Seeking to stamp out the highly pathogenic H5N1 strain of avian influenza, France and other countries have been culling record numbers of poultry—more than 16 million birds since December 2021 in France alone.

From Science Magazine May 11, 2022