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porcupine

Short-beaked echidna
Photo: Short-beaked echidna, by Gunjan Pandey, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons.

Top Scientific Problems with Evolution: Homology

The spines of Australian echidnas and North American porcupines are remarkably similar. Read More ›
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Doctor’s Diary: Porcupine Quills and Other Examples of Nature’s Foresight

A newborn porcupine passes through its mother’s birth canal without causing her any injuries. How? Read More ›

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