7/1/2026 at 11:50:26 PM
I climb a lot around the forests where I live in Switzerland. In one area there are a lot of yew trees - deadly to mammals. Just 30 grams of the needles will stop your heart. The bright red berry tastes very nice and isn't poisonous but the seed, if just one seed has a crack in it and you swallow it it will stop your heart in about thirty minutes. German kings have used it to kill themselves after being defeated by Roman armies so that they don't have to surrender.Anyway, there's an animal here, I assume marmots, that swallows the berries whole and shits them out as a half-digested diarrhea onto the tops of rocks, logs, anywhere high enough to mark their territory. Probably better than shitting out a charcoal briquette that you hope won't roll over... but they seem to know not to chew and crack the seeds.
by comrade1234
7/2/2026 at 2:32:06 AM
They are planted in graveyards in the UK, it prevents grazing animals from entering and soiling up the place. The animals seem to know to keep away. They cant nibble the grass without getting a mouthful of the needles.by nickdothutton
7/2/2026 at 8:40:56 AM
I’ve heard a different reason for their presence in graveyards: because yew kills grazing mammals that eat it, it was cut down everywhere that people grazed animals, which excluded graveyardsby jna_sh
7/2/2026 at 9:41:57 AM
My understanding is that churches were built next to yew trees, not yew trees planted next to churches.Pre-Christian religions had many associations with yew trees (they live for a long time, give off mildly hallucinogenic gasses on hot days, discourage animals), and so built their holy sites around them. When Christianity came to Britain, churches were deliberately built on pagan holy sites to overrun the old religions, in the same way that early Christianity took over roman holy days (Saturnalia -> Christmas, Lemuria -> All Saint's Day). This led to churches being built next to sites with copious yew trees.
by 14113
7/2/2026 at 4:56:31 PM
The Christmas/ Saturnalia link is a myth.by nimbleal
7/2/2026 at 1:04:55 PM
Here in the US the most common large wild grazing animals are deer, which can quite happily eat yew.by HarHarVeryFunny
7/2/2026 at 5:23:33 AM
I hear Yew is uniquely poisonous to horses (I mean, they are especially susceptible to it)by golem14
7/2/2026 at 10:36:09 AM
The more I learn about horses the more they seem like a creature that’s continually trying to die - and humans get to try and stop them succeeding.by lostlogin
7/2/2026 at 2:33:52 PM
Perhaps that's how aliens would see humans. Perpetually trying to die except for a small group of humans fighting disease, monitoring and protecting climate, keeping order, etc.by test6554
7/2/2026 at 12:37:50 PM
Horses are especially susceptible to *everything*.Millenia of selective breeding to try for the healthiest strongest animals we can, and they're still shit.
They'll get ill if they breathe wrong. They'll get ill if they eat a mouthful too much or too little of grass that's ever so slightly too green. They'll get ill if it's too rainy or not rainy enough.
How the hell did they even evolve?
by ErroneousBosh
7/2/2026 at 7:27:26 PM
Selective breeding for being useful to humans, not for being able to survive on their own.by vova_hn2
7/2/2026 at 12:43:39 AM
If they die within 30 minutes, you would never see the scat of those who crack the seeds.by zhoBEENG
7/2/2026 at 2:55:37 AM
There has to be a term for these very specific claims. 30 g in 30 minutes? Give me LD50 numbers.by xattt
7/2/2026 at 3:20:50 AM
Taxine alkaloids[0] The estimated lethal dose (LDmin) of taxine alkaloids is approximately 3.0 mg/kg body weight for humans.[27][28] Different studies show different toxicities; a major reason is the difficulty of measuring taxine alkaloids.[29]
It goes on to say that rats are ~20mg/kg, which would put a human at somewhere less than 1.4grams.Which is close enough to, "any exposure at all will kill".
by 3eb7988a1663
7/2/2026 at 5:10:17 AM
> Which is close enough to, "any exposure at all will kill".How much is in one seed?
I could only find a few sources saying that you would need to eat about 50g of the needles to reach the LD, and that's... A lot. There's no way a child would accidentally manage that, for example (even assuming LD for a child is much lower). But I couldn't find specific numbers for seeds.
Not being a killjoy here, I grew up around yew trees and I was always told to be careful of them, but not with any sense of panic that would suggest "any exposure at all will kill”. I think you'd have a bad time even with low exposure but death seems unlikely by accident.
by esperent
7/2/2026 at 5:32:02 AM
A child might not need the whole 50g.Not a good way to go, BTW: https://pmc.ncbi.nlm.nih.gov/articles/PMC4462509/
by golem14
7/2/2026 at 12:41:15 PM
> There's no way a child would accidentally manage that, for example (even assuming LD for a child is much lower). But I couldn't find specific numbers for seeds.My partner was worried when we moved into our current house that our then-18-month-old son would eat the poisonous cotoneaster berries on the bush in the garden.
But it turns out the LD50 is something like 50g/kg which means that even for a 12kg child they'd be eating huge heaping bowlfuls of them before anything happened.
As it turns out, he did eat one of the cotoneaster berries, spat it out, and went looking for some of the far nicer tasting alpine strawberries instead. The cotoneaster berries taste quite particularly horrible, and no-one is going to ever eat even close to the LD50 of them.
by ErroneousBosh
7/2/2026 at 7:49:06 AM
This reminds me of the old “bats use sonar and can fly super precisely without crashing into each other in pitch black” and then it turns out that they crash into each other all the time.by taneq
7/2/2026 at 10:32:03 AM
You have a source or observation for that? All I can find is the exact opposite, that they do just fine even in challenging conditions.by Kim_Bruning
7/2/2026 at 8:01:29 PM
If you watch them fly it always looks more chaotic than birds.by type0
7/2/2026 at 11:43:39 AM
I often cycle a road with lots of bats hunting and one evening two slammed into my face and upper body (and one only avoided by ducking quickly). It's pretty obvious that they are not perfect navigators.by 0x000xca0xfe
7/2/2026 at 12:39:32 AM
We covered yew extensively in toxicology class in vet school, but I didn't know about any animals that eat the berries. My favorite fact about yew is that the Iowa State Lloyd Veterinary Center is named after a toxicologist, yet has yew planted for decoration all around the building.by MillironX
7/2/2026 at 6:51:35 AM
> if just one seed has a crack in it and you swallow it it will stop your heart in about thirty minutes.That is complete bullshit and you shouldn't be posting it this confidently.
Those seeds are very poisonous, yes, but not in that cartoonish way. It's not cyanide.
by hypfer
7/2/2026 at 8:03:07 AM
even cyanide isn't cartoonish https://www.youtube.com/watch?v=i6hOVhQQ9hIsubstance itself is not what kills you - it's the dose
by NooneAtAll3
7/2/2026 at 11:55:52 AM
There Is No Safe Dose of Prions: https://pmc.ncbi.nlm.nih.gov/articles/PMC3156228/by murderfs
7/2/2026 at 10:39:01 AM
> substance itself is not what kills you - it's the doseDoesn’t that apply to every single thing that exists?
by lostlogin
7/2/2026 at 3:52:53 PM
Yes. IIRC Congress paid for a study in the early 20th century to try to nail a definition of the word "poison" by injecting mice with different quantities of bleach. The conclusion was that everything is a poison at the right dose. Most medicines are great at low doses, but then kill you when you take too much of them. Heck, even water is a poison.by qingcharles
7/2/2026 at 11:00:31 AM
The old toxicology proverb is: "The dose makes the poison"by reltnek
7/2/2026 at 1:41:27 PM
I like to extend it to: "the portion makes the poison." Beyond getting the alliteration, it also includes food, which I think is important. A glass of water won't kill you, two gallons of water will. An ice cream cone once in a while is nothing; one every day will make the doctor's eyes go wide.by butlike
7/2/2026 at 4:37:36 PM
Jesus. I had a colonoscopy. Don't tell me about drinking 2 gallons of water. I won't even get started on an ice cream cone a day.by hackeraccount
7/2/2026 at 2:53:35 AM
There was a yew bush on my walk to primary school. When berries were in season, I used to pick and squish the berry between my fingers because the shape was unique (berry with a seed that sticks out‽) ands its slimy feel. Thank goodness it never amounted to anything more, even through transdermal absorption.by xattt
7/2/2026 at 10:05:57 AM
The amount of childhood survival that comes down to "thankfully I only poked it and didn't eat it" is kind of alarming in retrospectby ErigmolCt
7/2/2026 at 10:34:32 AM
It’s probably selected for. We’re pokers by natural selection.by ycombinete
7/2/2026 at 5:14:25 AM
We had them in our yard growing up, I recall regularly playing with the berries for the exact same reason. Funny enough my dad did warn me not to eat it, but based on this post eating the berry itself would have been one of the few ways it’s not toxic. Had no idea about the rest of the plant being so toxic until today.by appplication
7/2/2026 at 10:09:25 AM
The fact that the inviting red part is mostly fine but the plant around it is deadly is very on-brand for natureby ErigmolCt
7/2/2026 at 3:27:21 AM
Oh wow I think we had these on the way to school when I was a kid too. Everyone told us not to eat them so we used to put the berries in our mouth and spit them out to show how tough we were. Wow we were very very stupid kids.by idiotsecant
7/2/2026 at 8:34:04 AM
I think one of the problems is people thinking kids are more stupid than they are, and blanket "don't do that" statements without explanations don't really work for kids.If they had told you they were highly poisonous instead of just telling you "not to eat them" you might have taken them more seriously. And if they had given you a taste of the red berry around it (which is sweet but not that special either, and the texture is not great) you might just have thought it was not necessary to play with them at all.
But that requires education at all levels, around here (Belgium) I sometimes see parents who seem deadly afraid of anything nature, I tell my kids to eat blackberries and they softly tell their kids next to us not to do that. You end up with generations who just don't know anything about what's around them and will eventually do stupid things.
by seszett
7/2/2026 at 8:50:26 AM
It takes longer than people tend to think before kids learn to infer things well at all, and so being explicit about causal chains tends to make kids more likely to take advice. E.g "put your coat on" might not lead the child to think it is cold, and even a "put your coat on, it's cold outside" might still not lead the child to realise that means they'll freeze without the coat. A lot of tantrums would be avoided if parents were more explicit about why they're giving certain advice.by vidarh
7/2/2026 at 12:15:52 PM
Depends on the kid and their age.Me to my 3.5-year-old boy after evening bath (winter here right now): Your feet are going to get cold, don't you want to put on your slippers to keep them warm?
Him: No!
And if I put them on he'll take them off as soon as I'm not stopping him from doing so.
For putting on warm enough jacket for school I try similar reasoning which has yet to work with any kind of consistency, still mostly lands up having a bit of a tantrum all the way until I hand him over to his teacher.
His two-year older sister was a lot less difficult at his age.
by jonathanlydall
7/2/2026 at 6:04:33 PM
Sometimes you just need to let them experience that you are right first, as long they're just making themselves miserable for a bit.Also, it works wonders to let them make a choice between two acceptable solutions instead of giving them space to say no.
"Do you want the slippers or the thick socks?"
It doesn't always work, but kids that age are learning to set boundaries, and giving them the illusion of agency often helps.
by vidarh
7/2/2026 at 1:46:27 PM
"If you don't put on your slippers, your toes will fall off and then you won't be able to walk like everybody else!"Sometimes the old-world spook stories work.
by butlike
7/2/2026 at 3:18:21 PM
I wouldn't recommend getting wrong things into their heads, because you (or someone else) will eventually have to teach them that it was not true, or they will discover it themselves, and that will undermine trust in the other things you said.by seszett
7/2/2026 at 9:43:52 AM
> A lot of tantrums would be avoided if parents were more explicit about why they're giving certain advice.For that, parents would need time. But if we have to spend half of our day with work or work-related tasks (commute, lunch break)...
Society (or let's be real, capitalism) forces us to work unhealthy amounts of hours and then wonders why there aren't enough children and of the children that remain, they dumb down every year...
by mschuster91
7/2/2026 at 5:22:50 PM
It saved me a lot of time when my son was little because it meant he argued less with me over the necessity of things at the cost of an extra sentence here and there.by vidarh
7/2/2026 at 1:19:27 PM
[dead]by fartcoin67
7/2/2026 at 12:16:18 PM
I don’t care if it is poison. Never gonna give yew up.by RickJWagner
7/2/2026 at 1:43:31 PM
Yew gonna eat that?by butlike