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Foster's rule

[ faw-sterz rool, fos-terz ]
/ ˈfɔ stərz ˌrul, ˈfɒs tərz /
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noun Biology.
a theory asserting that members of a species will evolve into smaller or larger versions of themselves depending on available land area and resources as well as predator populations: Foster’s rule explains the phenomena of insular dwarfism and insular gigantism.
QUIZ
SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
Should you take this quiz on “shall” versus “should”? It should prove to be a quick challenge!
Question 1 of 6
Which form is used to state an obligation or duty someone has?
Also called is·land ef·fect, is·land rule .

Origin of Foster's rule

Named in 1964 after J. Bristol Foster (born 1936), Canadian biologist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use Foster's rule in a sentence

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