Why Do Canada Geese Fly at Night?

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Why do Canadian geese fly at night?Stefan Pociask

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There are actually very good reasons that these geese fly at night, and I will go over them with you. But first ... I must point out that any goose you see that is carrying a valid passport from the great country of Canada, may be called a Canadian Goose. All others should be referred to by their actual name, which is Canada Goose, or Branta canadensis, if you prefer.

I can’t count how many nights at 10 p.m., at midnight, at 3 a.m., and any and all other hours of the night, I have had that all too familiar “Honk! honk-honk-honk HONKhonk HONK HONKhonkhonkhonk HONK honk HOOOONK!” cacophony pass right outside my bedroom window, as the familiar flying-V formations of Canada geese fly over my home.

Those V formations are quite extraordinary. You can’t tell from the ground, but the lead goose is the lowest of the bunch. Each goose behind is slightly higher than the one in front of it, all the way to the last goose, which is flying the highest. They do this because of the aerodynamics of their wings. The only goose that is using all its wing power is the lead goose—point-man, so to speak. When that goose flaps its wings, it causes a certain turbulence of the air that’s following the wing. The next goose in line benefits from this swirling air, and doesn’t need to apply 100 percent of its wingpower. The next goose again benefits from that one, and so on down the line. Flying in formation this way adds 71 percent more distance that they can fly, than when flying alone.

So who gets chosen to be point-man? You’d think the one with the map! Or ... the leader? Or the new guy? No. None of these. They actually take turns. When one gets tired, he will drop back so he can rest a bit and benefit from another goose’s turbulence. When migrating ... in good weather ... with favorable winds, a strong tail wind ... these guys can make up to 1500 miles in a single day ... Hard to imagine, but it’s been done. They are migration masters.

So … the flying at night thing … I’ve already touched upon one of the reasons they prefer the night. It has to do with that turbulence I just mentioned.

You see ... many other large birds (and these are large birds) use thermals to gain altitude and to soar on. Raptors do this. Hawks, eagles, etc. During the day, the landscape is riddled with all kinds of thermals rising from the ground, all depending on what the surface looks like below; how much heat was absorbed and stored from the sun; if it’s dark or light … or even water. These thermals are great for raptors—lots of vertical air movement, all over. But geese don’t soar, and they don’t have need to fly in circles. They have somewhere to go. And all those daytime thermals are a pain in the butt; doesn’t make for smooth sailing. Plus, they interfere with the aforementioned wing turbulence that they use to keep from tiring. At night, several hours after sunset, the Earth cools and those pesky vertical thermals disperse.

So that’s one reason they like the night. Another reason for night flight is to prevent overheating (makes sense, right?). Nights are cooler, so birds that expend a lot of energy with constant flapping (as opposed to soaring) take advantage of the cool of the night.

A third reason is also something I’ve already mentioned. Hawks! And eagles! And falcons! All those guys are diurnal hunters, meaning they hunt during the day. Which goose in its right mind would want to share the not-so-friendly skies with something called a raptor? Now, if you’ve ever seen flocks of geese on the ground and tried to get amongst them or feed them or something … you may already know how mean and nasty they can get. People have used geese instead of watchdogs. They are tough! Especially on the ground. But falcons, hawks, and eagles, hitting them from the air often spells doom. In other words ... their goose is cooked. During the day, they often rest and feed and rejuvenate in the water, where they are safe from raptor attack. As long as they stay in the water.

So given the choice, they take the red-eye.

Otherwise, this can happen ... (WARNING: Extremely dramatic footage follows of a falcon/goose battle. Also extremely exciting! Who will win?!)

You’ll certainly see Canada geese fly during the day. But the smart goose prefers the night.

All migratory birds are split up into three classes, regarding migration habits. Nocturnal Migrants, are the first classification, [and they fly] at night. This would include most of the seed-eating songbirds, such as sparrows and thrushes. They will fly all night, then rest up, top off the tank with food, and try to stay out of sight of raptors during the day.

The second group is the Diurnal Migrants, who migrate during the day. These are often the insect-eaters; jays, swifts, swallows, larks, etc. They benefit greatly from the daytime thermals during their journey—not for reasons of soaring, like raptors use thermals, but rather because these warm updrafts send up clouds of insects from the fields, right into the paths of the migrating birds, like a food delivery service. Most insects are so light that a gust of wind or a thermal current can lift them high into the air—and unwittingly into the beak of a hungry swallow.

And the third class of [migratory birds] are those that have a preference, but actually migrate day and/or night, depending on the circumstances. Canada geese, and many waterfowl, fit into this last category.

This post originally appeared on Quora. Click here to view.

What’s the Difference Between a Primary and a Caucus?

Looks like these stickers were handed out at a primary, not a caucus.
Looks like these stickers were handed out at a primary, not a caucus.
jdwfoto/iStock via Getty Images

Leading up to a U.S. presidential election, each state (and territory) must vote to decide which candidates it wants to compete in that election—but how exactly that decision happens differs from state to state. Some have primaries, while others hold caucuses.

A primary is a relatively straightforward process that resembles any other election. Essentially, you go to your designated polling station, which could be anywhere from a school to a sports complex, and check your favorite candidate on a ballot. Generally, any candidate who receives at least 15 percent of the votes is eligible to earn delegates, the elected officials who vote to decide whom to choose as the party’s presidential nominee at the national convention. Those delegates are then divided among eligible candidates in proportion to how many votes they earned. Since primaries are short and simple, almost all states and territories use them to help choose presidential nominees these days.

However, there are several holdouts that still opt for caucuses, a more manual (and more complicated) voting process with roots in late 18th-century American elections. During a Democratic caucus, participants arrive at a local venue and split up into groups based on which candidate they’re supporting; there’s usually a group for undecided voters, too. Volunteers count how many people are in each group, and—similar to primaries—any candidate who has at least 15 percent of the supporters is deemed “viable,” or eligible to earn delegates. Unlike primaries, caucuses don’t end after that initial tally. Supporters of candidates who didn’t meet the 15-percent threshold can then join groups for viable candidates; volunteers do a recount, and delegates are apportioned based on those updated numbers. Republican caucuses are similar, only the voting happens on an informal private ballot.

If your state holds a primary, there’s a pretty good chance you can get in and out without talking to more than a person or two—and it could even come as a surprise if someone tries to persuade you to vote for a certain candidate. At Democratic caucuses, on the other hand, that’s an integral part of the process. Before the initial count, people try to convince undecided voters to join their group (or supporters of a candidate who looks like they might not reach the viability threshold), and after the initial count, another wave of campaigning happens in order to claim supporters of unviable candidates. This, in addition to all the manual counting and re-counting, means that caucus attendees can count on being there for hours longer than primary participants.

Caucuses are a great way to see how citizens really feel about presidential hopefuls on a deeper, more personal level than polls and stats are often able to tell us, but the overall hassle—not to mention the fear of inaccurate vote-counting—has caused more and more states to switch to primaries in recent years. As Business Insider reports, there are only eight places that are still holding caucuses in 2020: Iowa, Nevada, North Dakota, Wyoming, Kentucky (Republican only), American Samoa, the Virgin Islands, and Guam.

Because Iowa’s caucuses are always first on the schedule, they’re often considered a little more important than some others—find out why here.

[h/t Business Insider]

Why Isn't Fish Considered Meat During Lent?

AlexRaths/iStock via Getty Images
AlexRaths/iStock via Getty Images

For six Fridays each spring, Catholics observing Lent skip sirloin in favor of fish sticks and swap Big Macs for Filet-O-Fish. Why?

Legend has it that centuries ago a medieval pope with connections to Europe's fishing business banned red meat on Fridays to give his buddies' industry a boost. But that story isn't true. Sunday school teachers have a more theological answer: Jesus fasted for 40 days and died on a Friday. Catholics honor both occasions by making a small sacrifice: avoiding animal flesh one day out of the week. That explanation is dandy for a homily, but it doesn't explain why only red meat and poultry are targeted and seafood is fine.

For centuries, the reason evolved with the fast. In the beginning, some worshippers only ate bread. But by the Middle Ages, they were avoiding meat, eggs, and dairy. By the 13th century, the meat-fish divide was firmly established—and Saint Thomas Aquinas gave a lovely answer explaining why: sex, simplicity, and farts.

In Part II of his Summa Theologica, Aquinas wrote:

"Fasting was instituted by the Church in order to bridle the concupiscences of the flesh, which regard pleasures of touch in connection with food and sex. Wherefore the Church forbade those who fast to partake of those foods which both afford most pleasure to the palate, and besides are a very great incentive to lust. Such are the flesh of animals that take their rest on the earth, and of those that breathe the air and their products."

Put differently, Aquinas thought fellow Catholics should abstain from eating land-locked animals because they were too darn tasty. Lent was a time for simplicity, and he suggested that everyone tone it down. It makes sense. In the 1200s, meat was a luxury. Eating something as decadent as beef was no way to celebrate a holiday centered on modesty. But Aquinas had another reason, too: He believed meat made you horny.

"For, since such like animals are more like man in body, they afford greater pleasure as food, and greater nourishment to the human body, so that from their consumption there results a greater surplus available for seminal matter, which when abundant becomes a great incentive to lust. Hence the Church has bidden those who fast to abstain especially from these foods."

There you have it. You can now blame those impure thoughts on a beef patty. (Aquinas might have had it backwards though. According to the American Dietetic Association, red meat doesn't boost "seminal matter." Men trying to increase their sperm count are generally advised to cut back on meat. However, red meat does improve testosterone levels, so it's give-and-take.)

Aquinas gave a third reason to avoid meat: it won't give you gas. "Those who fast," Aquinas wrote, "are forbidden the use of flesh meat rather than of wine or vegetables, which are flatulent foods." Aquinas argued that "flatulent foods" gave your "vital spirit" a quick pick-me-up. Meat, on the other hand, boosts the body's long-lasting, lustful humors—a religious no-no.

But why isn't fish considered meat?

The reason is foggy. Saint Paul's first letter to the Corinthians, for one, has been used to justify fasting rules. Paul wrote, " … There is one kind of flesh of men, another flesh of beasts, another of fish, and another of birds" (15:39). That distinction was possibly taken from Judaism's own dietary restrictions, which separates fleishig (which includes land-locked mammals and fowl) from pareve (which includes fish). Neither the Torah, Talmud, or New Testament clearly explains the rationale behind the divide.

It's arbitrary, anyway. In the 17th century, the Bishop of Quebec ruled that beavers were fish. In Latin America, it's OK to eat capybara, as the largest living rodent is apparently also a fish on Lenten Fridays. Churchgoers around Detroit can guiltlessly munch on muskrat every Friday. And in 2010, the Archbishop of New Orleans gave alligator the thumbs up when he declared, “Alligator is considered in the fish family."

Thanks to King Henry VIII and Martin Luther, Protestants don't have to worry about their diet. When Henry ruled, fish was one of England's most popular dishes. But when the Church refused to grant the King a divorce, he broke from the Church. Consuming fish became a pro-Catholic political statement. Anglicans and the King's sympathizers made it a point to eat meat on Fridays. Around that same time, Martin Luther declared that fasting was up to the individual, not the Church. Those attitudes hurt England's fishing industry so much that, in 1547, Henry's son King Edward VI—who was just 10 at the time—tried to reinstate the fast to improve the country's fishing economy. Some Anglicans picked the practice back up, but Protestants—who were strongest in Continental Europe—didn't need to take the bait.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

This story was updated in 2020.

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