From time to time, politicians and other rulers-of-men like to categorize the natural world not according to biology, but rather for convenience or monetary gain. Take, for example, the tomato. The progenitor of ketchup is a seed-bearing structure that grows from the flowering part of a plant. It is, by definition, a fruit. In 1893, however, the US Supreme Court ruled in the case of Nix v. Hedden that the tomato was a vegetable, subject to vegetable import tariffs. Even if the tomato is, technically, a fruit, it tends to be treated in American cuisine as a vegetable, wantonly littering our salads with its jelloey gooeyness.

Corn and rice are another good example. The Bible forbids Jewish people from eating chametz - foods made from wheat, barley, spelt, rye, or oats - on Passover. Ashkenazi Jews consider corn, rice, and legumes, a class of foods called kitniyot, as forbidden on Passover as well. It isn't that they're forbidden, per se, but that they're easily confused for the real thing. As I learned in my high school Talmud class, the medieval Rabbis decided to forbid these not-technically-forbidden grains because of a principle called marit ayin, which literally means "what it looks like." The Wikipedia explanation is quite good: "While not against the laws of passover to consume kitniyot, a person might be observed eating them and thought to be eating chametz despite the law, or erroneously conclude that chametz was permitted. To avoid this confusion, they were simply banned outright."

Still, neither the Supreme Court's reclassification of the tomato is a fruit, nor the medieval Rabbis' designation of corn and rice as forbidden grains, is the most amusing example of non-scientific categorization. The Catholic Church has them all beat.

There were once between 60 and 400 million beavers (Castor canadensis) occupying the rivers and streams of North America, from the great white north to the deserts of northern Mexico. Then the Europeans came. With them came disease along with an insatiable desire for beaver pelts and for beaver castoreum, a urine-like secretion often used in perfume and cologne. Combined with the once-sustainable hunting of beaver by indigenous North Americans for their meat, the beaver population rapidly declined. (The species is now rebounding, thanks to trapping regulations, and now includes some 6 to 12 million individuals)




And it's not just oversized rats that make for good eating in the run up to Easter, either. I have it on authority from my cousin Jerome (who knows everything) that "iguana tail soup is a fave for Lenten meals in Nicaragua." Yum.

For more on beavers:

Respect the Boundary of the Beaver

For more on bad taxonomy:

Are Sheep Better at Botany than the US Government?

For more on dietary traditions during Lent:

Hyenas Give Up Eating Garbage For Lent, Hunt Donkeys Instead

Naiman R.J., Johnston C.A. & Kelley J.C. (1988). Alteration of North American Streams by Beaver, BioScience, 38 (11) 753-762. DOI:

Worsley P. (2009). The Physical Geology of Beavers, MERCIAN GEOLOGIST, 17 (2) 112-121. DOI:

Image via Flickr/Minette Layne.