Star Trek Tribbles vs. Guinea Pigs: Side By Side Comparison of the Universe's Two Cutest Most Irritating Animals
Ever notice how guinea pigs look remarkably like tribbles? Tribbles, for those unfamiliar with the Star Trek oeuvre, are small, furry animals that multiply like crazy. How do guinea pigs and tribbles match up pound for pound? 
Guinea pig photo on left courtesy of Skoop102 via Flickr
1. Physiology
At this juncture, there is no known tribble anatomy book (at least, not known to me). But there is a diagram of a tribble cross section. They have no visible features except for their fur, which comes in a range of colors. Guinea pigs have noses, ears, eyes, and mouths.
2. Predators
Tribbles are "mortal enemies" of the Klingon Empire. Their natural (or rather, genetically engineered) predator is the "glommer." Guinea pigs are mortal enemies of nobody in particular. Their natural predators are cats, coyotes, owls, hawks, dogs, snakes, and humans (who enjoy them roasted with a cold beer on the side).
Delicious guinea pig photo courtesy of Jeff G. via Flickr
3. Disposition
Tribbles purr when held. So do guinea pigs. Tribbles basically eat and reproduce. So do guinea pigs. The longest living guinea pig (according to the Guinness Book of World Records) was almost 15 years old. Did it mellow out as it aged? The longest living tribble was 5 years old (according to this article written by someone with just slightly more time on his hands than everybody else).
Captain Kirk has a tribble issue
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