Mr. Forbush and the Penguins - Nature's Balance: Penguins and Skuas' Agreement
Tringham: [in a flashback; voiceover]
The skuas say in effect to the penguins, We'll keep the other skuas off in return for a fair share of your eggs and chicks. In this way nature ensures the survival of a sufficient number of penguin chicks. A providence no to be despised by the thinking scientist.
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