Score
Title
15
How To Search ELI5: A Quick Reminder About Rule 7
6394
ELI5: Why does a familiar word sound unfamiliar after you overly repeat it?
388
ELI5: There's 21% oxygen in air. When we breathe out, there's still 16% oxygen in the exhaled air. Why's our lung so inefficient?
7656
ELI5 why is it that we always see so many new awesome ways to fight cancer and yet it seems nothing of it is ever being used?
2710
ELI5: Why is CTE brain damage such a hot topic in the NFL, but don't hear anything from the Rugby community?
20
ELI5: say if Kim Jon Un got assassinated; what would happen to the country?
57
ELI5 If symptoms of a cold serve the function of ridding our body of the illness, then do cold medicines that reduce these symptoms slow our recovery?
16
ELI5: how did women shaving their legs/armpits come about and why did men not do it too?
51
ELI5: That feeling you get when you’re traveling in a car and you go over a small but quick hill and your stomach has that weird sensation in it right as you reach the top and are hearing back down.
169
ELI5: A lot of toddlers have a physical reaction to eating something they really enjoy (usually a little dance of some sort) Why do we stop doing this as grown ups?
12578
ELI5:How is it that sperm and eggs can be frozen for years to be used later but we can't freeze a living person without killing them?
9
ELI5: How did it happen that the population of Oman upwards of age 25 contains a lot more men than women?
53
ELI5: Why do some plastics discolor and turn white when they are stressed/bent?
4
ELI5: Why might it be so hard for me to fall asleep again after waking up, but once my alarm goes off and I'm supposed to wake up, I suddenly can't stop hitting snooze and going back to sleep?
3
ELI5: Why doesn’t the United States have a high speed rail system?
4
ELI5 why is there so much activity with the Ring of Fire recently? How do we know which earthquakes are directly linked? Should California be as worried as the media makes out?
4
ELI5: Why do we feel the need to swallow when we are in tense situations?
62
ELI5 - Is someone born a narcissistic or is it learned behavior?
2
ELI5: For cold prevention, why are disinfectants recommended for cleaning public surfaces but discouraged for washing hands?
155
ELI5: How come the same prescription for eyeglasses produces thick "coke bottle" lenses can be used for paper thin contacts?
2
Eli5:Why are some people naturally better at fighting than others?
19
ELI5: Why does laying down help with nausea?
2
ELI5: How some people who smoke 2 packs a day have the lung film of a person who has never smoked?
17
ELI5: How are those giant prize winning vegetables, like the 150lb zucchini, grown?
2
ELI5: Why is air trapped in ice that's been still for hours?
2
ELI5: Why does "HD-ready" 720p TV panels have a resolution of 1366*768 rather than a 1280*720.
2
ELI5: Why do football coaches make substitutions in the last 10-15 mins in a game? What is the logic?
7
ELI5: Why is it bearable to look down from thousands of feet in the air, but terrifying to look down from only about 50 feet or so?
5
ELI5: When a candle burns, where does the wax go?
4
ELI5: Why when nervous does our mouth become dry ?
1
ELI5: What happens in our bodies in we get scared?
1
ELI5: Why do online transactions not require PIN?
1
ELI5:How does Modernity and Modernism affect Physical Space?
1
ELI5: Why are there still a few operating Blockbusters, and where does the money that they make go?
5
ELI5: What is the science behind ICBMs?
1
ELI5: What is the reason for people/investors to put a lot (!!) more money into a crowdfunding project than the final product is actually worth?
1
ELI5 Why do salt and vinegar flavour crisps turn my lips purple and tingly?
0
ELI5: Why do sports have seasons? Why are they not played year round?
3
ELI5: Why is it when my stomach is doing soothing, it makes a loud audible sound? What causes it and why is it so loud?
1
ELI5: how does copyright work?
1
ELI5:Why is the Atompower treaty so important to Iran?
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425 cwigs96 Basically all animals have nitrogenous waste that they need to get rid of. How they get rid of it varies based on their environment. Fish just release it as ammonia, because they're constantly surrounded by water, so they don't need to put any more effort into it. Mammals concentrate their nitrogenous waste into urea, which packs more nitrogen into each molecule, so we can store more in less water. Urea is a fairly good packaging system for us, because it allows us to put our body's waste in a modest volume of water, and carrying around a modest volume of extra liquid doesn't really interfere with our ability to move around and do stuff. Birds fly, though. For them, weight is mission critical, and they've evolved to turn their nitrogenous waste into uric acid, which packs even more nitrogen into a molecule than urea. Also, uric acid is white. TLDR: birds store waste differently to save weight, the stuff they turn it into is white
2569 JavarisHavarti Bird's excrement is actually a combination of their "urine" and feces. Birds don't "pee" like mammals, they excrete all waste from the same orifice called a "cloaca," which is like a fancy butthole. The white junk is nitrogen and urea and other stuff that would normally be excreted in urine in other animals.
73 menagerie18 We mammals excrete nitrogenous body waste (somewhat toxic) in urine because we can store a lot of water fairly conveniently and this dilution makes the waste less internally harmful. Birds can't carry much water or they would be too heavy to fly, so their kidneys have adapted to produce more concentrated dry nitrogenous wastes requiring less water waste. Source: b.s. in biology
211 bijhan While everyone else is correct that bird waste includes both feces and urine, they are also forgetting something else super important: rocks. Birds don't have teeth. They break down their food with a gizzard instead. When a bird eats, they eat teeny-tiny rocks, too. Instead of going into the stomach, the rocks go into the gizzard. The gizzard is wrapped around a special part of the esophagus, and the rocks are rubbed and grinded on the food as it makes its way to the stomach. When a rock in the gizzard has been pulverized into dust, it passes into the waste of the bird as a rock-water sludge. And that pulverized stone is white.
28 Sell200AprilAt142 Because it's their urine as well as their poop. The concentrated urine content of birds is a white paste. (If it were highly watered down like mammals it would also be a light coloured fluid)
23 Urdnot_wrx they aren't. their urea- pee is white. their poo is brown. same with snakes and reptiles. They only have one hole, so it's a poopee
6 RandomInterrogator Uric acid is a combination of feces and nitrogenous waste that streamline the disposal of unwholesome chemical elements.
4 [deleted] [removed]
3 noruthwhatsoever It's not actually feces- the white part is actually basically their urine. The darker matter is their poop
1 throwawayweirdo1 Bird feces are actually a mix of feces (brown) which is the remnant of undigested food and uric acid (white and crystalline) which is a product of protein metabolism (nitrogenous waste). Uric acid is a concentrated form and does not require to be dissolved into lots of water for safe excretion (humans excrete urea which needs water and fishes excrete ammonia which requires much larger quantities of water).
1 9xInfinity So I don't do bird medicine (or bird law) but human feces is colored the way it is partly due to the presence of bilirubin, which is unsurprisingly a dark yellow-brown sort of color. Presumably avians manufacture a different sort of bilirubin, or less is in their excrement, or etc etc. But the reason our poop is brown is because of this product produced by the liver.
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1 scud42 Fun fact, during huckleberry season in Montana, the rocks are covered in purple/blue bird poop.
1 meee39 The white is actually dried up urine. The black is feces. If you look at fresh bird poo (I know) you will see there is no white.
552 0 [deleted] [removed]
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421 0 cwigs96 Basically all animals have nitrogenous waste that they need to get rid of. How they get rid of it varies based on their environment. Fish just release it as ammonia, because they're constantly surrounded by water, so they don't need to put any more effort into it. Mammals concentrate their nitrogenous waste into urea, which packs more nitrogen into each molecule, so we can store more in less water. Urea is a fairly good packaging system for us, because it allows us to put our body's waste in a modest volume of water, and carrying around a modest volume of extra liquid doesn't really interfere with our ability to move around and do stuff. Birds fly, though. For them, weight is mission critical, and they've evolved to turn their nitrogenous waste into uric acid, which packs even more nitrogen into a molecule than urea. Also, uric acid is white. TLDR: birds store waste differently to save weight, the stuff they turn it into is white
2577 0 JavarisHavarti Bird's excrement is actually a combination of their "urine" and feces. Birds don't "pee" like mammals, they excrete all waste from the same orifice called a "cloaca," which is like a fancy butthole. The white junk is nitrogen and urea and other stuff that would normally be excreted in urine in other animals.
70 0 menagerie18 We mammals excrete nitrogenous body waste (somewhat toxic) in urine because we can store a lot of water fairly conveniently and this dilution makes the waste less internally harmful. Birds can't carry much water or they would be too heavy to fly, so their kidneys have adapted to produce more concentrated dry nitrogenous wastes requiring less water waste. Source: b.s. in biology
216 0 bijhan While everyone else is correct that bird waste includes both feces and urine, they are also forgetting something else super important: rocks. Birds don't have teeth. They break down their food with a gizzard instead. When a bird eats, they eat teeny-tiny rocks, too. Instead of going into the stomach, the rocks go into the gizzard. The gizzard is wrapped around a special part of the esophagus, and the rocks are rubbed and grinded on the food as it makes its way to the stomach. When a rock in the gizzard has been pulverized into dust, it passes into the waste of the bird as a rock-water sludge. And that pulverized stone is white.
31 0 Sell200AprilAt142 Because it's their urine as well as their poop. The concentrated urine content of birds is a white paste. (If it were highly watered down like mammals it would also be a light coloured fluid)
23 0 Urdnot_wrx they aren't. their urea- pee is white. their poo is brown. same with snakes and reptiles. They only have one hole, so it's a poopee
6 0 RandomInterrogator Uric acid is a combination of feces and nitrogenous waste that streamline the disposal of unwholesome chemical elements.
3 0 [deleted] [removed]
3 0 noruthwhatsoever It's not actually feces- the white part is actually basically their urine. The darker matter is their poop
1 0 throwawayweirdo1 Bird feces are actually a mix of feces (brown) which is the remnant of undigested food and uric acid (white and crystalline) which is a product of protein metabolism (nitrogenous waste). Uric acid is a concentrated form and does not require to be dissolved into lots of water for safe excretion (humans excrete urea which needs water and fishes excrete ammonia which requires much larger quantities of water).
1 0 9xInfinity So I don't do bird medicine (or bird law) but human feces is colored the way it is partly due to the presence of bilirubin, which is unsurprisingly a dark yellow-brown sort of color. Presumably avians manufacture a different sort of bilirubin, or less is in their excrement, or etc etc. But the reason our poop is brown is because of this product produced by the liver.
2 0 [deleted] [removed]
1 0 [deleted] [removed]
1 0 scud42 Fun fact, during huckleberry season in Montana, the rocks are covered in purple/blue bird poop.
1 0 meee39 The white is actually dried up urine. The black is feces. If you look at fresh bird poo (I know) you will see there is no white.