Document Type

Article

Language

eng

Format of Original

3 p.

Publication Date

11-1968

Publisher

University of Chicago Press

Source Publication

The American Naturalist

Source ISSN

0003-0147

Comments

Published version. The American Naturalist, Vol. 102, No. 928 (November/December 1968): 555-558. Publisher Link. © University of Chicago Press 1968. Used with permission.

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Biology Commons

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