That, ladies and gentlemen, is a duck penis. Science blogger Ed Yong has a great article up today about these freaky, corkscrew behemoths and the equally freaky, labyrinthine duck vaginas. A researcher from Yale has been studying both, and thinks these rather baroque naughty bits evolved in competition with one another, as female ducks tried to evade rape (or, rather, impregnation by a rapist) and male ducks tried to get around those barriers.
The shape of the female duck's vagina is a physical barrier that prevents the male from launching forth his ballistic penis to its fullest extent. It won't stop a drake from ejaculating (and those in Brennan's trials always did), but it does limit how far the semen is deposited along the vaginal tract. Not all males are hit equally hard by these defences. Those that the female actually wants to mate with have an easier time. If she's into a male, she strikes a pose that signals her receptiveness, keeping her body level and lifting her tail feathers high. She repeatedly contracts the walls of her genital tract, relaxing them for long enough for favoured suitors to achieve full penetration.
Males who try to force themselves upon her receive no such help and have to cope with vigorous struggling. The female may not be able to resist such advances, but her convoluted vagina gives her ultimate control over where the sperm of her current partner ends up. The fact that only 3% of duck offspring are born of forced matings suggests that females are indeed winning this battle of the sexes.
I have offered plenty of advice on caring for your cast iron cookware. Stop seasoning it in the house, use your BBQ. Seasoning this stuff in the oven (my favorite old way,) or on the stove smokes your house up. Just throw the shit on the grill. Super thinly put a coat of oil on […]
One of the major contributors to greenhouse gases is the methane that cows belch up as they break down cellulose, but five years ago, research from Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO) found that adding small amounts of a pink seaweed called Asparagopsis to cows' diets eliminated the gut microbes responsible for methane […]
On Slate Star Codex (previously), Scott Alexander breaks down Invisible Designers: Brain Evolution Through the Lens of Parasite Manipulation, Marco Del Giudice's Quarterly Review of Biology paper that examines the measures that parasites take to influence their hosts' behaviors, and the countermeasures that hosts evolve to combat them.
Are we done with capsule coffee makers yet? Sure, they’re easy. But they are not so easy on the environment, and it’s debatable whether they actually make a better cup. Luckily, there’s never been a better time to switch back to the good old reliable drip method – especially when drip coffeemakers have quietly been […]
If there’s one thing that stayed consistent through the last decade or so of tech industry turmoil, it’s the love affair between techies and Linux. There’s just a ton you can do with the OS, and its open-source format means you can customize your rig from the ground up. Apparently not content with that level […]
Accidents happen. And when they do, you’re going to want a dash cam for a second pair of eyes. At the minimum, a decent dash cam can save you vast sums of time and money in case of an accident. But a really good dash cam can do a whole lot more. Here are six […]