o*****4
发帖数: 1245 | 1 某大坝钓鱼。21inch大嘴
turbin 没开，用3/8 oz rooster tail, okuma SST 9 尺杆，shimano siena 2500.
到坝下第二杆就中了。毫无技术含量。。。
由于水浅，rooster taile 在10次左右cast时挂石头，填海了。。
十分钟后放水，新钓点完全不知道放水怎么钓，数次挂底，jig加curly tail 中混血一
条。
大鲈鱼其实很难吃。不过从来没上过21inch的，就作为trophy fish留了。其实有点后
悔，处理起来味儿很大。。。而且其实肉质不会好。。下次坚决不要了。P.S， 鲈鱼我
还是C&R为主的。。。这回是迷了心窍啊。。
混血是本着大小通杀，坚决肉粽的宗旨搞的。搞得心安理得。见恶俗水槽照。。
本钓点4月盛产大hybrid,为本州著名钓点。届时turbin一开必定中鱼。水面钓鱼船如舰
队般一字排开，蔚为壮观。
援引一个红脖子的文章：
I don’t know about you, but I can say with certainty that it’s not too
often that I find a p... 阅读全帖 |
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L***s
发帖数: 290 | 2 沙龙兄好。
花鲢、白鲢、wiper、buffalo、王八等大部分鱼是在大坝上的，用的是刀神老大的一拖
二钓法配上Mister Twister® Curly Tail Grub上的，grub链接：
http://www.cabelas.com/product/Mister-Twisterreg-Curly-Tail-Gru
jig head可用1/8 oz + 1/16 oz或1/16 oz + 1/32 oz，视水流缓急目标鱼大小而定；
grub用2 inch的，颜色可选pump pepper或chartreuse，视水流缓急水色清浊而定。
也可以用1/4 oz的橙色jig head配上3 inch的chartreuse grub拖底，上过walleye、
catfish、buffalo。
1/6 oz的Rooster Tail inline spinner也不错，上过草鱼、walleye等等。
水面硬饵也上过鱼，不过用的不好，就不多说了。
以上是在下浅见，错误不足之处还请各位大神指正：） |
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P*******l
发帖数: 105 | 3 TGIF，but the weather was pretty bad: 43F with strong wind.
Off work around 6:00pm, thought of going home. Then wife called and was
asked to pick up the kids from their swimming practice at 7:30 pm. Suddenly
I had one hour and half to kill.
Turned the steering wheel abruptly and drove to the river bank. No one there!
Took the tie off, put on the dirty fishing jacket and long trousers on top
of the working suit, here I come!
First, I tied a 1/4 oz jig head with a 3 inch chartreuse colored twist t... 阅读全帖 |
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n*********3
发帖数: 534 | 4 One throws 40 coins on the floor, high chances are 20 heads and 20 tails.
But the chance of all the heads located on side (or one area) and all the
tails on another side (or another area) is extremely low.
The chance of all 20 heads and all 20 tails are randomly mixed is very high.
Now, if one throws the coins one by one, the above logic should be the same. |
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a***a
发帖数: 8941 | 5 I have another question about P229:
I like the Scorpion, however, I do not like the beaver tail because it may
snag into clothes
But I searched online, and there is no way to remove the beaver tail unless
you cut it. I definitely do not want to do that.
Is there any other P229 without beaver tail, but has SRT trigger? |
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P*****s
发帖数: 263 | 6 前二个月，偶尔发现这个雪山飞狐版，高手林立。潜水多日，非常喜欢。对南海神尼等
各位高手由衷钦佩。看到Line Prophet 100 vs Mantra的那个贴，恨不得钻地洞里。如
果早看到，俺就不会买错雪板了。本来想在那里插嘴跟贴，注册了个ID，居然不让发帖
。今天这算第一帖，很多行规和术语还没看懂。经常看到斑竹给包子，好事还是坏事？
肉包子还是菜包子？好像高手发言都是三言二语的，俺写一大篇，是不是违反规矩？不
过确实有问题向高手请教，包子还是窝头也管不了那么多了。
上周末去了趟Kirkwood。NN多年前去过一次，早就记不清楚啥样儿了。这次就跟第一次
一样，很新鲜。雪场人不多，不用排队。REI或者Sports Basement有卖$50/二张成人票
。所有周日小孩免费。一家四口花50块钱滑了一天，很过瘾。上周日还是最后一天可以
用当天的票钱用来买下年度的季票，外带免费buddy ticket和BBQ。Kirkwood雪场开到
五月一号。其实还有不少雪，但是人少雪场不赚钱，就关了。五月和六月份只能去
Squaw和Mammoth滑雪了。
白天太阳很足，夜晚下点小雪。见到有不少人穿短袖短... 阅读全帖 |
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S********t
发帖数: 3431 | 7 谁给你说tail push就不连贯不利于控制速度，谁给你说tail push跟不学点杖有必然关
系。
自己看视频里面，tail push就很明显，人家不连贯，滑的不好？
你真搞笑，有本事奔段你自己的视频让我们看看正确的滑法是什么样的？ |
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S********t
发帖数: 3431 | 8 1'13''~1'26''很明显的有tail push。这个视频里面的风格，跟通过flex+roll edge的
carved short turn的滑法有明显的区别。
纠正你个观念，tail push不是错误，过多的tail push才是错误。 |
|
|
r******h
发帖数: 809 | 9 ··Custer State Park··
抱着“宁可错看一万，决不放过一个”的指导方针，我以平均10mph的速度蹭完了
18miles的Widelife Loop，看到的动物除了一种不知道名字的头顶是红色的鸟外，还有
Bison，Pronghorn Antelope，White-tailed Deer，Black-tailed Deer，Prairie
Dogs和Begging Burros。其中Pronghorn Antelope的数量最多，公的、母的、小的都看
全了。看到了这些动物过马路、吃草、打架，看到了White-tailed Deer奔跑的时候竖
起的白色尾巴… 最有意思的还是Burros。看到车辆停下，他们就会围过来，跟人讨吃
的。五、六只大Burros就这么围过来，在我车左右两边的反光镜上蹭啊蹭，在我车窗上
舔啊舔，用它们白色的长着两个大鼻孔的大鼻子在我车上拱啊拱~
因为一整天都在下雨，很多照片都是朦胧胧的...
Bison，吃奶中
Pronghorn Antelope，相亲相爱
Prairie Dogs，翘首盼望
Begging Burros，乞讨者
White-ta |
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d*********n
发帖数: 439 | 10 不看白不看的路边景点:
Newfound gap
位于贯穿大雾山南北的441公路中间，这里的Gap是指山脊上的低点，海拔只有5046
feet，和Clingmans Dome海拔相差甚远，距离却只有7迈。1872年以前，Indian Gap（
在Newfound Gap西边1.5迈）一直被认为是最低的，直到瑞士地理学者Arnold Henry
Guyot用气压计测出这里更低，所以一拍脑袋就叫Newfound gap，至于为什么不以自己
的名字命名是因为人家的名字已经用在了大雾山的第二高峰Mount Guyot上。Newfound
gap有restroom，大观景台和大停车场，可以欣赏开阔的mountain view。
景观：5/5
位置（此项均以从Gatlinburg/北门进园子为准）：5/5
经纬度：35.611032，-83.425567
Meigs falls
位于Little River Gorge Road（从公园北门去Cades Cove必经）上，Sugarlands
Visitor Center西边13迈。
景观：3/5
位置：5/5
经纬度：35.669... 阅读全帖 |
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s*****t
发帖数: 370 | 11 I think 3D effect is created by some kinds of Photoshop blur filter/Tilt
Shift Tool.
If you take a close look on dog's tail and left nearby ground in the same
line, you may see:
dog's tail-- clear and sharp
left nearby ground- very blur
Even use very large aperture (F 2.0 or F 1.2) and very long telephoto lens(
500mm) to get very shadow of DOF, left nearby ground in the same line of dog
's tail should be clear and sharp. If you look kid right nearby ground , the
same thing: blurred by post-pr... 阅读全帖 |
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R***a
发帖数: 41892 | 12 祖先有的后代都有，只不过有的是退化成为遗迹了。
class HomoSapien : Ape{
[obsolete]
override object tail() {
if (this.DNA[83838] == Status.Normal) return null;
else return new tail("this is a tiny tail");
}
} |
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n****4
发帖数: 12553 | 13 FORT LAUDERDALE, Fla. — A mysterious, submarinelike vessel appeared off the
coast of Highland Beach just over a week ago, and its discovery has
officials and beachgoers wondering exactly what it is and how it got there.
The U.S. Coast Guard confirmed they investigated the object, but they don't
know what it is.
Mark Engelhardt, of Austin, Texas, was in town visiting his parents when he
discovered a 20-foot-long steel vessel shaped like a submarine beached
about 150 yards off the coast. The brigh... 阅读全帖 |
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m*****O
发帖数: 3558 | 14 http://www.parade.com/features/pet-quiz/cat-quiz.html
小咪用这个测聪明些！
1) Watch your cat's ears for a couple of minutes. Do they move?
a. Almost never.
b. Sometimes, but only in reaction to sounds.
c. Constantly, even when the room is quiet and he’s resting.
2) How does your cat react when something moves in the same room?
a. Not at all, unless it’s very close or very interesting.
b. She goes to investigate—or leaves the room.
c. She tracks the movement with eyes and ears first, and then determines
wh... 阅读全帖 |
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r*****a
发帖数: 27155 | 15 有！上翘的叫gay tail，但是合格的裁判肯定能分出来gay tail和high了往上翘的tail |
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S*******t
发帖数: 3956 | 16 【我爱你】
作者：余秀华
英文翻译：慢兔
巴巴地活着，每天打水，煮饭，按时吃药
阳光好的时候就把自己放进去，像放一块陈皮
茶叶轮换着喝：菊花，茉莉，玫瑰，柠檬
这些美好的事物仿佛把我往春天的路上带
所以我一次次按住内心的雪
它们过于洁白过于接近春天
在干净的院子里读你的诗歌。这人间情事
恍惚如突然飞过的麻雀儿
而光阴皎洁。我不适宜肝肠寸断
如果给你寄一本书，我不会寄给你诗歌
我要给你一本关于植物，关于庄稼的
告诉你稻子和稗子的区别
告诉你一棵稗子提心吊胆的
春天
I love you
Live with eagerness every day, fetching water, cooking, taking medicine on
time
Put myself in when the sunlight is right, as if put in a piece of citrus
Drink different teas in turns, chrysanthemum, jasmine, rose, lemon...
All these beautiful things are d... 阅读全帖 |
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w********y
发帖数: 29 | 17 都要去睡了，看见movie版上有人说功夫好看。
本来老公周五晚上说要看，我说肯定不好看，就没去。
但是别人一说好，我就觉得好，刚才就跟他要去看。
他说等周末再去，我说明天就去。
然后我主动说扔硬币决定。他说我总是赖皮，这次不能赖皮。我说一定不赖皮，一局就决
定。
我要head,他要tail.
由我扔，结果是tail.
然后我说改成三局两胜。由他来扔。
我还要head.结果气死了，又是他赢。
然后我说改成五局三胜，我改要tail.
结果又是他赢。
我气的都哭了。但是还是接受这个结果，没要求再扔。他说就应该这样，不能总是耍赖。
他心肠这么硬，如果是以前，我肯定要发脾气，。但是今天忍住了，现在也一点都不生气
。我觉得已经进步了。看来以后什么都扔硬币决定好了。现在可以心平气和的睡觉去了。
谢谢今天大家关心，确实帮助还是很大的。 |
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s*****a
发帖数: 356 | 18 一篇英文小故事，也是第一次写英文故事~~求帮忙看看、修改英文~~也欢迎任何建议~~
谢谢大家~~~包子不够发的话我再去买点来//鞠躬感谢！
April and her best friend
April and her family just moved to a little town called Bart. It’s their
fifth move since April could remember. For her father’s work, they moved
frequently and April was the “new kid” in school every couple of years. It
was hard always when it seemed that everyone else had their best friend
while April had to make new friends.
But April wasn’t always lonely; she has her secret - Wishy Bear. Wishy Bea... 阅读全帖 |
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b********n
发帖数: 38600 | 19 6 The Locusts of the Abyss
（Revelation 9:7-11）
7 The locusts looked like horses prepared for battle. On their heads they
wore something like crowns of gold, and their faces resembled human faces. 8
Their hair was like women’s hair, and their teeth were like lions’ teeth.
9 They had breastplates like breastplates of iron, and the sound of their
wings was like the thundering of many horses and chariots rushing into
battle. 10 They had tails with stingers, like scorpions, and in their tails
they ha... 阅读全帖 |
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j****g
发帖数: 597 | 20 no. head insert is when u advance in the linked list, put the current node
to the head of the list.
tail insert is find the tail, then start from begining, and insert each node
as tail's next node. |
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b***i
发帖数: 3043 | 21 第一你自己要调试。程序不是写出来就能用的，必须调试。
第二，这是啥？
if(head==NULL&&tail==NULL){//都null了，下面还->next?
head->next=tail;
tail->prev=head;
} |
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w******p
发帖数: 166 | 22 if you just want to tail from time to time:
$ ssh remote_host "tail /path/to/file"
or you want to monitor it as it grows:
$ ssh -tC remote_host "tail -f /path/to/file" |
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|
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m*****s
发帖数: 2227 | 25 我也是在网上查的。
With brown or black mice and rats, an additional light source may be
necessary to aid in visualizing the tail veins.
It is more difficult to visualize the tail vein in black mice. In these
cases, we have found that spraying 70% isopropanol on the tail increases the
contrast. |
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D*a
发帖数: 6830 | 26 自己配的，
网上搜了搜，这是跟我们完全一样的protocol
Final concentration of tail digestion buffer (TDB):
50 mM KCl
10 mM Tris-HCl (pH 9.0)
0.1 % Triton X-100
0.4 mg/ml Proteinase K
Add 100 ul of TDB per tail piece (2-5 mm) in a microcentrifuge tube. Be
careful not to cut too much tail.
Incubate the tube at either 60 C for 3 hours, with gentle mixing every 30
minutes, or 55 C overnight.
Incubate the tube at 94 C (or boil) for 10 minutes to denature the
Proteinase K.
Spin in microcentrifuge at top speed for 15 minutes. |
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X*******0
发帖数: 134 | 27 还有个可能会不会是我塞的tail有问题,我加的全是清一色的多聚甘氨酸,我是看中甘氨
酸小柔韧性好,不知这样的tail好不好,你们有没有什么建议的tail序列? |
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A******y
发帖数: 2041 | 28 Yup, necrosis after injection. You can try if you don't believe me. The
tech helping my mice injections used to work in CharlesRiver for over 5
years. She said it is a bad idea to warm the tail up. One of the lab
warmed the mice tail for IV, the veterinarian was not so pleased after
seeing the mice tail falling off. |
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b***k
发帖数: 2673 | 29 ☆─────────────────────────────────────☆
littleegg (爱吃茶叶蛋) 于 (Wed May 21 10:02:40 2008) 提到:
N coins on the floor, every time you randomly pick one, if it is head, flip
it to tail; if it is tail, toss it. after many many times, what is the ratio
btw head vs. tail coins on the floor?
☆─────────────────────────────────────☆
shallowater (shalloWater) 于 (Wed May 21 10:42:20 2008) 提到:
1:2
flip
ratio
☆─────────────────────────────────────☆
littleegg (爱吃茶叶蛋) 于 (Wed May 21 14:04:54 2008) 提 |
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h*****a
发帖数: 52 | 30 1. There are some unbiased coins (equal probability of having head and tail
when tossed). Initially, all the coins are tossed. The following steps are
followed after that:
- turn all the Head up coins to Tail.
- toss all the Tail up coins.
Find the probability of finding the a coin Head up after 'n' pairs of steps,
( or to frame it differently, find the number of coins with Head up) (Hint:
think in terms of ratio)
Ideas? |
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f*****k
发帖数: 353 | 31 61. Coin toss problem #3
Suppose you have a coin in which the probability of flipping a heads is p,
where p>=0.5 . What is the expected number of flips it will take for the
number of heads to equal the number of tails, assuming the first flip is a
tails?
答案给的是:1/（2p - 1），solution给的挺含糊的
我想用conditional expectation: let E[N | -1] be the expect number if the
first flip is a tail
E[N | -1] = p*2 + (1 - p)*( E[N | -2 ] + 1)
往后就不好算了。。。
请教一下解法，谢谢 |
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u****4
发帖数: 5 | 32 random walk. X(head)=-1, X(tail)=1. let u be the expected number. then
u=p*1+(1-p)*(u+u+1)
where the first term on the right corresponds to the case that the next flip
is a head. the second term is for a tail, and you need 2->1, then 1->0, so
it's u+u+1 (1 is the initial tail). |
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c***z
发帖数: 6348 | 33 如果火星了请轻拍
Someone walks into your room and dumps a huge bag of quarters all over the
floor. They spread them out so no quarters are on top of any other quarters.
A robot then comes into the room and is programmed such that if it sees a
head, it flips it to tails. If it sees a tail, it throws it in the air. The
robot moves around randomly forever. Will there be a convergence in
distribution of heads vs. tails? |
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k*******d
发帖数: 1340 | 34 3. 我觉得他在问Volatility smile. Hull书上有，那个distribution不是严格log
normal的，在K大的地方，tail比Log normal小，K小的地方，tail大，这个是equity
option。foreign currency option是两边都是fat tail
7.
int** Darray = new int*[nRow];
for (int i = 0; i
Darray[i] = new int[nCol];
int a[3][4] is not dynamic.
?
it' |
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w**********y
发帖数: 1691 | 35 Ok. I was not clear, and might already confused you.
The correlation you mentioned is defined as Cov(X,Y)/\sqrt{var(X)var(Y)}
I was talking about the tail/extreme dependence, defined as lim P(X>u|Y>u)
as u goes to infty.
For Gaussian copula, the corrlelation of X and Y is rho, which is in the
copula function; But the tail dependence is ALWAYS zero.
But when default/extreme event happens, there should be some kind of chain
reactions, and maybe high tail dependence. Gaussian Copula totally ignores... 阅读全帖 |
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i**w
发帖数: 71 | 36 这些是最近两个月每次面试完，给C同学(谢谢陪我一路哈~~)的汇报整理出来的。其实
也没怎么整
理...
大部分都是常见的题。有些常见的题就直接没列。还有些当时忘了的，现在更记不起来
了。
有些是电话上的，有些是onsite。题目有些没说清楚，大家将就，领会精神。
本来什么都没定下来的时候一肚子感想和经验，想着有一天搞定了，一定好好总结总结
。现在定下来
了，倒没了兴致了。。。但想想从版上看过那么多面试题和面经，我争取写点儿，励志
型的，给出身
不好的同学们一点鼓励。也顺便攒攒人品，希望OPT快点儿下来!
1. Singly linked list, write a function to print the nodes backwards.
2. solve dS = (a - b*S)dt+sigma*dW Calculate the variance of S(T)
3. what does it look like if we plot: floating variable against the
actual value assigned to the variable?
4.... 阅读全帖 |
|
i**w
发帖数: 71 | 37 这些是最近两个月每次面试完，给C同学(谢谢陪我一路哈~~)的汇报整理出来的。其实
也没怎么整
理...
大部分都是常见的题。有些常见的题就直接没列。还有些当时忘了的，现在更记不起来
了。
有些是电话上的，有些是onsite。题目有些没说清楚，大家将就，领会精神。
本来什么都没定下来的时候一肚子感想和经验，想着有一天搞定了，一定好好总结总结
。现在定下来
了，倒没了兴致了。。。但想想从版上看过那么多面试题和面经，我争取写点儿，励志
型的，给出身
不好的同学们一点鼓励。也顺便攒攒人品，希望OPT快点儿下来!
1. Singly linked list, write a function to print the nodes backwards.
2. solve dS = (a - b*S)dt+sigma*dW Calculate the variance of S(T)
3. what does it look like if we plot: floating variable against the
actual value assigned to the variable?
4.... 阅读全帖 |
|
c**********e
发帖数: 2007 | 38 For 5, I think we can use a doubly linked list plus a hash_map.
The linked list should have a tail pointer. Each node is of a structure
struct Node {
Obj* obj;
long id;
Node* next;
Node* prev;
}
The linked list has both a header pointer and a tail pointer. The hash_map's
key is its id. It also has a Node*, which point to its corresponding Node
in the linked list.
add(id,*obj), erase(id), deque() can all be done in O(1).
add(id,*obj) adds at the head, and adds it to the hash_map too.
... 阅读全帖 |
|
h******5
发帖数: 58 | 39
对，我也是直接拿掉的，我只用了70% to 130%的moneyness，并且是用的out of money
call and put。
关于stable的问题，对，就是parameter一直在变。我backtest同一个product的时候，
tail经常会变。比如我做crude oil的front month，算两个tail的VaR，今天出来是-0.
3， 0.17； 明天的结果可能是-0.25,0.2。每天的变化量都可能会很大。我用的
disribution 叫meixner，是比较flexible的一个distribution，有兴趣可以看一下下
面的paper。
https://perswww.kuleuven.be/~u0009713/004wsreport.pdf
还有有意思的一点是risk neutral distribution永远是left fat tail。谢谢回答，欢
迎继续brainstorm。
另，不求二导的话怎么算risk neutral density？ 有比较靠谱的方法吗？ |
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q***a
发帖数: 26 | 40 my 2 cents
separately consider two initial situations a0=0 and a0=1;
only consider a0=0 here since a0=1 is similar.
There are N_group-1 switchs, if N_group is odd, (N_group-1)/2 0->1 and equal
number 1->0. if N_group is even,, (N_group+1)/2 0->1 and others 1->0
you easily get possibility of each single result that meet above condition.
then consider number of such results.
the rest of coins (N-N_group) need to fill into corresponding interval which
should be leaded with the same side, and any in... 阅读全帖 |
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s**c
发帖数: 1247 | 41 q看correlation
p看partial correlation
如果是AR(p)，那么partial cut off at lag p，correlation是tail off
MA(q)，那么correlation cut off at lag q, partial tails off
ARMA(p,q)的话都是tail off
这个都是指理论值，实际求出来的estimate会有差异的 |
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D***r
发帖数: 7511 | 42 来自主题: Statistics版 - 问一个问题 我们在做一个项目。简单说就是假设一个词在一个句子里出现的概率p(w)有一个分布。
如果两个词都在同一句子里出现，则有一个联合分布p(ww')。
然后如果两个词经常一起出现，则可能意义相关（比如可能是一个词组，或者一个词代
表另一个词的属性，等等）
方法之一是用假设检验，也就是看p(ww')和p(w)*p(w')的关系。
我觉得应该用one-tailed test，因为我们是想找经常一起出现的
也就是p(ww')显著大于p(w)p(w')的。
所以H1：p(ww')>p(w)p(w')
但是负责这个项目的老师觉得应该用two-tailed test
H1: p(ww')!=p(w)p(w')
我觉得如果用two－tailed，算出的可能好多是互相排斥的词，根本就不make sense。
比如可能＂白色＂ ＂黑熊＂成了significant 的结果。
你们觉得呢？ |
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m*n
发帖数: 695 | 43 非常感谢！！！
这个我知道。 我用google看别人用spss 做 T.U 分析时，two-tailed 和one-tailed
p-value 都有， 为何我的只显示了two-tailed p-value ？ 我觉得还是我的设置不对
， 不知道怎么设置。 请指教！
再次感谢！ |
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r********n
发帖数: 40 | 44 用Copula比较好。heavy right tail or Gumbel copula都可以。因为它们都是左下角
less correlated, 右上角highly correlated. Do a copula fitting for 雄性数据，
find the correlation coefficient for say Heavy right tail copula. Let's say
we get 0.8 for the male data. Simulate 1,000,000or more data points based
on the 0.8 heavy right tail copula. 模拟数据越多越好，要能够覆盖雌性数据其中
一个边际分布。取雌性数据其中一个边际分布的值，我们取x轴好了。找到最接近的模
拟数据x轴上的值，再找到对应的模拟数据y轴上的max and min 值。比较empirical
female data y axis value and simulated y axis range for the same x axis
value.... 阅读全帖 |
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z**********4
发帖数: 467 | 45 (1) The first important thing is to determine the location of the mass:
(1) Adrenal
(2) Spleen/Spleen hilum.
(3) Pancreas tail
(4) Stomach
(5) Upper pole of kidney
Could not arise from kidney or spleen or pancreatic tail since there is
clear fat plane separating the mass from both organs.
I could not tell for sure if the mass is arising from the fundus of stomach
or adrenal gland.
(2) Contrast enhancement and internal feature of the mass.
Internal calcification: Possible. I can not tell for sure... 阅读全帖 |
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G***G
发帖数: 16778 | 46 1) Cottonmouth has a pit between eye and nostril, while water snake has no
pit.
2) Cottonmouth has single scale row underside of tail,
water-snake has double scale row underside of tail.
3) pupil in cottonmouth is elliptical.
while water-snake has a round pupil. (you mentioned)
4) cottonmouths open their jarws wide in a threat.
water-snakes don't. (you mentioned)
5) cottonmouths vibrates their tail when they are disturbed.
water-snakes don't.
6) water-snake will readily dive beneath the water t... 阅读全帖 |
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G***G
发帖数: 16778 | 47 1) Cottonmouth has a pit between eye and nostril, while water snake has no
pit.
2) Cottonmouth has single scale row underside of tail,
water-snake has double scale row underside of tail.
3) pupil in cottonmouth is elliptical.
while water-snake has a round pupil.
4) cottonmouths open their jarws wide in a threat.
water-snakes don't or if they open, they don't open as wide as cottonmouths.
5) cottonmouths vibrate their tail when they are disturbed.
water-snakes don't.
6) water-snake will readily ... 阅读全帖 |
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a***a
发帖数: 12425 | 48 【珍稀动物】萌萌大美瞳---超濒危的绒哆倭丛猴
前两天看到的一个关于世界二十五种最濒危的灵长动物的帖子，看到第一个猴子的图片
一下子就被吸引了。它有一对扇风耳，一双滚圆的眼睛，一只可爱的鼻子，一条长长的
刷子似的大尾巴，双手双脚紧紧地抓在一个树枝上面。这种猴子名叫Rondo Dwarf Gala
go (Galagoides Rondoensis)，在网上查了一下，中文翻成了一个很拗口的名字：绒哆
倭丛猴。
绒哆倭丛猴是一种体重仅两盎司（六十克）的小型物种，属于灵长目原猴亚目，和狐猴
、懒猴、眼镜猴等萌物们亲缘关系不远。直到一九九六年人们才知道这类物种的存在，
并从那时起把它们视为丛猴种类中最小的一种。如今绒哆倭丛猴已经从濒危类变为极度
濒危类动物。
绒哆倭丛猴的大眼睛和大耳朵不单单是用来卖萌，主要是用于在夜间活动，吃昆虫和果
实，而白天它们就会搭一个窝在树上睡觉。绒哆倭丛猴居住在非洲大陆坦桑尼亚海岸的
一些旱生森林中，它们的家并不需要多大的地方。尽管有些这类森林是在国家公园的范
围内，然而，人类的开荒活动，不管是为了种田、还是获得木材和木炭，让它们的小小
家园变得支离破碎、狭窄不堪。... 阅读全帖 |
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i*****s
发帖数: 15215 | 49 ☆─────────────────────────────────────☆
keah (小五) 于 (Tue Aug 28 11:56:35 2012, 美东) 提到:
迟到的征文，答应了的事情一定要做到啊。
在北美的所有毒蛇中，水腹蛇cottonmouth一直享有盛名，这种蛇频繁的出现在各种
rural legend中，在水边活动的人多多少少都听过关于水腹蛇是多么的恐怖，传说中它
会追逐游泳的人，也有人误入了满是水腹蛇的洞穴死状凄惨，至少我在北美钓鱼多年，
总是有老渔夫关照我小心这种蛇，也在水边听过不少人发誓赌咒说他们差点被水腹蛇咬
了的故事云云。
但事实上人们对水腹蛇有着太多的误解，出于自身安全的考虑我仔细的研究过
cottonmouth并且有幸见过一次，这种蛇其实并不多见，大部分的报告其实都是跟它长
得像的水蛇；传说中爬满了蛇的蛇洞也不存在，水腹蛇是独居的动物；追逐人更是荒唐
，固然水腹蛇的毒液可以杀人，人更容易杀它，自然界不可能让追着人咬的蛇在进化中
生存下来的。那么水腹蛇究竟是怎样一种生物呢。
水腹蛇（Agkistrodon piscivorus）属于蝰蛇蛇科蝮... 阅读全帖 |
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