Hosted by Sandra Tsing Loh, The Loh Down on Science is a fun way to get your daily dose of science plus a dash of humor in less than two minutes.
Hosted by Sandra Tsing Loh
Airs Weekdays 2:31, 3:31 and 5:49 a.m.

The Beetles

She’s got a unibrow! He needs a manssiere!

This is Sandra Tsing Loh with the Loh Down on Science.

We all know that traits that are attractive in one sex aren't always so great in the other.

Humans cope through online dating, but what do other animals with tricky traits do?

Japanese and English ecologists attempted to find out, by studying the broad-horned flour beetle.

In these insects, big jaws are sexy in males, but not in females. Why? Because the same muscular body shape that can support big jaws in males makes it hard for females to carry eggs.

After mating generations of beetles of various jaw sizes together, here's what the team found: Large-jawed females more often produced sons, while small-jawed females more often had daughters. Oddly, the male’s jaw size didn't affect offspring sex ratios--only the female’s.

So the female is clearly in control, but how she does it?

Still a mystery. And big jaw or no, she's clearly not talking.

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