No. 0038 / 1 402

Eastern green mamba

Dendroaspis angusticeps

名前について： The species name angusticeps comes from Latin words meaning 'narrow' and 'head'.1

命にかかわる地球でいちばん命にかかわる動物のひとつ。かまれたら、すぐに助けを呼ぼう。すぐの手当てと抗毒素で、ほとんどの人は助かるよ。すぐに救急番号に電話しよう。

コブラ、マンバ、アマガサヘビ

かむ食べもの：肉

人への危険: 命にかかわる世界でいちばん危険な動物のひとつ。

The eastern green mamba is a highly venomous snake with a slender body and bright green back. It lives in trees along the coasts of southern and East Africa. Although it is one of the most common green mambas, it is shy and usually hidden in leaves, so it is rarely seen.1

すんでいる場所

Coastal regions of East and southern Africa, from Kenya south through Tanzania and Mozambique to KwaZulu-Natal, South Africa, plus Zanzibar.1

アフリカ

ホーム

It is mainly a tree-dweller that prefers dense, shady vegetation, including forest, thickets and farm trees such as citrus, mango, coconut and cashew. In coastal East Africa it sometimes enters houses and may shelter in thatched roofs.1

長さ

1.8 mから2.5 m (5.9 ftから8.2 ft)1

最高速度

時速約8.3 km（時速5.2マイル）

陸で, おおまかな予想

何を食べるの？

It eats birds and their eggs and chicks, small mammals including bats, arboreal rodents and arboreal lizards. It usually waits in ambush for prey, though it has also been seen actively hunting a sleeping bat.1

Eastern green mambaの写真 — Eastern green mamba。写真：Dick Culbert。 CC BY 4.0, iNaturalist.

見分け方

Bright green upperparts, sometimes with a few isolated yellow scales.1
Pale yellow-green belly.1
Juveniles are blue-green and turn bright green at about 75 cm long.1
Long, slender, coffin-shaped head. It can flatten its neck into a slight hood when threatened.1
The inside of the mouth is white or bluish-white.1

よくまちがえられるのは： Green forms of the boomslang are often called green mambas in Southern Africa. They have larger eyes and shorter heads. Green bush snakes of the genus Philothamnus are often confused with smaller eastern green mambas. The boomslang is also venomous.1

毒パワー

かむ

かむときに、毒が牙や歯から出るよ。

その毒（かむ・刺す毒）はどうなるの？

Its venom contains neurotoxins, which attack the nerves, and cardiotoxins, which damage the heart. Symptoms include swelling at the bite, dizziness, nausea, dehydration, laboured breathing and difficulty swallowing. These can progress to irregular heartbeat, convulsions and respiratory paralysis, which stops breathing and can be fatal. Paralysis may be mild or absent.1

人にとってどれくらい危険？

人への危険: 命にかかわる世界でいちばん危険な動物のひとつ。

A survey in southern Africa from 1957 to 1979 recorded 17 bites confirmed as eastern green mambas. Ten of these caused systemic envenomation, and no victims died. Bites are most common from September to February, the breeding season, when the snake is most irritable. The average dose able to kill a human is about 18 to 20 mg of venom, and one bite can deliver 60 to 95 mg (dry weight). In 2024, a YouTuber died after being bitten, following anaphylactic shock.1

こわいとき、どうするの？

It is shy and avoids people and predators, attacking only when it feels threatened, and it can flatten its neck into a hood.1

かまれたら

Severe bites must be treated immediately on site, as they can quickly prove deadly.1
その人をじっとさせて落ちつかせ、指輪やきついものをはずして、急いで病院へ：治療には抗毒素が使われるよ。

まず必ず救急番号（112、000、911）に電話しよう。これは一般的な応急手当の案内で、医療のアドバイスではないよ。応急手当の基本

安全に過ごそう

野生の動物には、小さくても、ねているように見えても、死んでいるように見えても、ぜったいにさわったり、つかまえたり、からかったりしないこと。
近づかないで。出会ったら落ちついて、ゆっくりあとずさりして、そのまま行かせてあげよう。
かまれたら：落ちついて、じっとして、救急番号（112、000、911）に電話するか、急いで病院へ行こう。見た目をおぼえておいてね。写真があると役に立つよ。

きみをねらっているわけじゃないよ。毒はエサをとったり身を守ったりするために使うだけで、本当はかくれていたいんだ。安全に過ごすためにもっと知ろう

世界のどこ？

アフリカアジアヨーロッパ北アメリカ南アメリカオーストラリアとオセアニア

どれくらい大きい？

どれくらい長い？

犬2.5匹を鼻からしっぽまでならべた長さバナナ14本をたてにならべた長さ100 mを43秒で走れる（いちばん速い人間は9.6秒）

Eastern green mambaは、きみとくらべてどれくらい大きい？

ブラウザで計算しているだけ。何も保存されないし、どこにも送られないよ。

どれくらい速い？

歩いている人 時速約5 km (3.1 mph)

Eastern green mamba 時速約8.3 km (5.2 mph)

自転車に乗った子ども 時速約12 km (7.5 mph)

知っておく価値あり

データ

Males fight each other during the breeding season, usually entwining and pushing to pin each other's heads down. These fights can last several hours, but the snakes do not bite each other.1

Unlike most elapid snakes, which hunt actively, it often waits in ambush for its prey, a style more common among vipers.1

On average, an individual moves only about 5.4 metres per day, and it can stay in the same place for days.1

It has the least toxic venom of the three green mamba species, but it is still highly venomous.1

The oldest recorded eastern green mamba was a captive snake that lived 18.8 years.1

うそ・ほんとう

うそ： It is an aggressive, fast-moving 'people-chaser'.

ほんとう： It is shy and elusive, usually hidden in trees, and it generally avoids people. It attacks only when it feels threatened.1

毒のエキスパート向け

学名: Dendroaspis angusticeps
グループ: コブラ、マンバ、アマガサヘビ
家族: Elapidae2
ならびかえ: Squamata
大陸: アフリカ
赤ちゃん: The female lays 4 to 17 eggs, usually 10 to 15, in leaf litter in hollow trees, from October to November. The young measure about 30 to 45 cm in the wild.1
寿命: 約18.8年1
人への危険: 5 / 5: 命にかかわる3