# Antarctic Treaty Act 1967, Paragraph 4

Extent: E+W+S+N.I.

Participating Governments shall limit the issue of such permits so as to ensure as far as possible that:
(a) no more native mammals or birds are killed or taken in any year than can normally be replaced by natural reproduction in the following breeding season;
(b) the variety of species and the balance of the natural ecological systems existing within the Treaty Area are maintained.

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Source: https://www.legislation.gov.uk/ukpga/1967/65/schedule/2/partn1/crossheading/article-vi/paragraph/4 (the official version)
Page: https://openlegislation.uk/antarctic-treaty-act-1967/schedule-2/partn1/crossheading-article-vi/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.