第 1069 号，共 1 402 张

Common backswimmer

Notonecta glauca

名字的由来： Its common names come from the way it swims on its back, using its hind legs like oars in a boat.1

无害对人无害。不用担心。

毛毛虫和虫子

咬伤吃：肉

对人的危险: 轻微像被蜜蜂蜇一下或更轻。对人基本无害。

The common backswimmer is a small water insect that swims upside down, under the surface of ponds. It hunts other small water creatures and can fly between ponds when the weather is warm. It is the most common backswimmer in much of its range.1

生活在

Large parts of Europe, North Africa, and east through Asia to Siberia and China1

欧洲

首页

It lives under the water surface in ponds, and it is also the most widespread of the four British water-boatmen. In warm late summer and autumn it flies between ponds.1

长度

1.3 cm到1.6 cm (0.5 in到0.6 in)1

最高速度

约 0.45 公里/小时（0.28 英里/小时）

游泳, 粗略估计

它吃什么？

It is a predator. It either waits for prey to pass by or swims and actively hunts it. It often feeds on mosquito (Culex) larvae at the surface, and mature females also dive to the bottom of shallow ponds to catch isopods (Asellus).1

Common backswimmer的照片 — Common backswimmer。照片：ingridaltmann。 CC BY 4.0, iNaturalist.

怎样认出它

Swims and rests on its back1
Body length is about 13 to 16 mm1
Females are larger than males1
Hind legs are fringed with hair and held out to the sides like oars when resting1
Body is covered in hairs, except on the head and legs1

毒液之力

咬伤

它咬的时候，毒液通过毒牙或牙齿出来。

它对人有多危险？

对人的危险: 轻微像被蜜蜂蜇一下或更轻。对人基本无害。

如果它咬人

被毛毛虫的蜇毛扎到：用胶带把毛粘掉，再清洗皮肤。不要揉。
被咬：清洗并冷敷。如果感到不适或容易出血，就去看医生。

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？

比你的小指还短

Common backswimmer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？

一只花园蜗牛 约 0.05 公里/小时 (0.03 mph)

Common backswimmer 约 0.45 公里/小时 (0.28 mph)

一个在游泳的人 约 3 公里/小时 (1.9 mph)

值得了解

事实

It breathes air but has no gills. It keeps a thin film of air around its body, which can last up to 120 days.1

It can tell prey from other backswimmers by the surface waves they make. Prey waves are between 70 and 140 Hz, while other backswimmers make waves below 40 Hz.1

Its air film reduces drag when it dives. Scientists use it as a model for reducing drag, with possible uses such as on ships.1

It can see in both day and night. Its pupil takes about 40 minutes to adjust to daylight and about 50 minutes to adjust to night light.1

给毒液专家

学名: Notonecta glauca
类别: 毛毛虫和虫子
家人: Notonectidae2
排序: Hemiptera
大洲: 欧洲
宝宝: It reproduces in the spring, and young backswimmers, called larvae, live in the water.1
对人的危险: 1 / 5: 轻微3