Top Scientific Problems with Evolution: Homology
The spines of Australian echidnas and North American porcupines are remarkably similar.
Nature’s Foresight: Pangolins, Giraffes, Porcupines, and More
Engineers designing a car have to plan for all kinds of conditions the car might encounter.
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?