第 0522 号，共 1 402 张

Western rattlesnake

Crotalus oreganus

需要看医生很少致命，但被咬了要去看医生。

咬伤吃：肉

The Western rattlesnake is a venomous pit viper that lives across western North America, from the Baja California Peninsula in Mexico to the southern interior of British Columbia in Canada. It is one of only three rattlesnake species still found in Canada, which is why its populations there matter.1

生活在

Western North America, from the Baja California Peninsula in Mexico to the southern interior of British Columbia, Canada1

北美洲

首页

It lives in dry southern-interior valleys in British Columbia. In winter it searches for denning sites on steep slopes surrounded by medium-sized rocks.1

长度

1.6 m (5.3 ft)1

最高速度

约 3.7 公里/小时（2.3 英里/小时）

在陆地上, 粗略估计

它吃什么？

It uses heat-sensing pits on its face to find prey. Adults eat birds, bird eggs, small mammals from mice to rabbits, and small reptiles and amphibians. Juveniles eat insects.1

Western rattlesnake的照片 — Western rattlesnake。照片：Connor Long。 CC BY-SA 4.0, Wikimedia Commons.

怎样认出它

Ground colour is dark brown, dark grey, olive-brown, or sometimes black or pale yellowish.1
Large dark blotches run along the back, with uneven white edges, and are wider than the gaps between them.1
A dark brown stripe with a white border runs from the eye to the angle of the jaw.1
The belly is pale yellow, usually with brown spots.1
Juveniles have clearer patterns that fade as the snake matures. The last two tail rings, at the base of the tail, are usually black.1

毒液之力

咬伤

它咬的时候，毒液通过毒牙或牙齿出来。

它的毒液会造成什么？

Its venom is both hemotoxic, meaning it damages blood and tissue, and neurotoxic, meaning it affects the nerves. In prey, it can cause paralysis, which stops the animal escaping. In people it is linked with cardiovascular effects, internal bleeding and headaches.1

它对人有多危险？

对人的危险: 严重被咬了要去看医生。死亡非常罕见。

如果它咬人

让人保持安静不动，被咬的肢体与心脏保持同一高度，摘下戒指和紧身物品，尽快送医院。

一定先拨打你的急救电话（112、000、911）。这里是一般急救指导，不是医疗建议。急救基础

注意安全

永远不要摸、抓或逗弄野生动物，即使是很小的，即使它看起来在睡觉或已经死了。
给它留出空间。如果遇到它，保持冷静，慢慢后退，让它走自己的路。
如果被它咬了：保持冷静，保持不动，拨打你的急救电话（112、000、911）或尽快去医院。记住它长什么样，拍张照片会有帮助。

它不是冲着你来的。它用毒液捕猎或保护自己，而且它更愿意躲起来。更多安全知识

在世界哪里？

非洲亚洲欧洲北美洲南美洲澳大利亚和大洋洲

它有多大？

它有多长？

和 3 只家猫鼻子接尾巴一样长和 9 根香蕉首尾相接一样长97 秒就能跑完 100 米（最快的人需要 9.6 秒）

Western rattlesnake和你比起来有多大？

只是在你的浏览器里算一算。什么都不会被保存或发送到任何地方。

它有多快？

一只陆龟 约 0.3 公里/小时 (0.19 mph)

Western rattlesnake 约 3.7 公里/小时 (2.3 mph)

一个在走路的人 约 5 公里/小时 (3.1 mph)

值得了解

事实

Its size depends on where it lives and on its diet. Snakes that eat lizards are much smaller than those that eat birds and mammals.1

The largest recorded Western rattlesnake measured 162.6 cm, but mainland adults often reach about 100 cm.1

It makes seasonal migrations between winter and summer habitats to follow its prey.1

Mating snakes are very sensitive to disturbance and quickly separate.1

Most females breed every two years, although about 10% breed in two years in a row.1

给毒液专家

学名: Crotalus oreganus
类别: 响尾蛇
家人: Viperidae2
排序: Squamata
大洲: 北美洲
宝宝: It gives birth to live young, usually 3 to 8 per litter (1 to 15 is the range), in August or September. Newborns are about 19 to 28 cm long.1
它在野外过得怎么样: Threatened in Canada (Schedule 1 federally threatened under Canada's Species at Risk Act). Previously listed as Least Concern on the IUCN Red List.1
对人的危险: 3 / 5: 严重3