Study Finds Evolution Doesn't Always Favor Bigger Animals

Biologists have long believed that bigger is better when it comes to body size, since many lineages of animals, from horses to dinosaurs, have evolved into larger species over time. But a study published this week by two biologists at the University of California, San Diego in an early online edition of the Proceedings of the National Academy of Sciences suggests that maxim, known as “Cope’s Rule,” may be only partly true.

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<p><a href="http://www.physorg.com/news9964.html">Study Finds Evolution Doesn't Always Favor Bigger Animals</a></p> <p>Biologists have long believed that bigger is better when it comes to body size, since many lineages of animals, from horses to dinosaurs, have evolved into larger species over time. But a study published this week by two biologists at the University of California, San Diego in an early online edition of the <i>Proceedings of the National Academy of Sciences</i> suggests that maxim, known as “Cope’s Rule,” may be only partly true. </p>