No. 0584 / 1 402

Western hognose snake

Heterodon nasicus

名前について： "Hognose" comes from its upturned nose, which looks hog-like. The scientific name nasicus comes from the Latin nasus, meaning "nose".1

無害人には無害。心配いらないよ。

後ろに牙のあるヘビ

かむ食べもの：肉

人への危険: 軽いハチに刺されたくらいか、それ以下。人にはほぼ無害。

The western hognose snake is a small, stout-bodied snake with an upturned nose that looks a bit like a pig's snout. It lives across much of North America, from southern Canada to northern Mexico, in sandy and gravelly places such as prairies and grasslands. It is often mistaken for a rattlesnake, but its bite is not regarded as dangerous to people.1

すんでいる場所

Southern Canada, through the United States, to northern Mexico. Endemic to North America.1

北アメリカ

ホーム

It favours areas with sandy or gravelly soils, including prairies, river floodplains, scrub, grasslands, semi-deserts and some semi-agricultural land. It has been found at elevations of up to 2,500 m (8,200 feet).1

長さ

13 cmから50 cm (5.1 inから1.6 ft)1

最高速度

時速約4.7 km（時速2.9マイル）

陸で, おおまかな予想

何を食べるの？

It mainly eats amphibians, such as large and medium tree frogs, small or medium toads and small lizards, and occasionally a rodent. It is not a true constrictor, so it bites and chews, driving its rear fangs into prey.1

Western hognose snakeの写真 — Western hognose snake。写真：Peter Paplanus。 CC BY 4.0, iNaturalist.

見分け方

Relatively small and stout-bodied, with adults rarely exceeding 40–50 cm in total length, tail included.1
A modified, upturned nose scale gives it a distinctive hog-like snout.1
Colour and pattern vary a great deal between subspecies and individuals.1
When threatened, it flattens its neck, hisses and may puff up its throat with air.1

よくまちがえられるのは： To an untrained eye, most individuals look much like rattlesnakes, which is thought to be a form of mimicry that makes predators wary. Its upturned snout and small, stout body are features to note.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？

The snake releases modified saliva from its Duvernoy's glands, which runs down a groove in its rear fang and helps break down the toxins of toads it eats. No deaths or whole-body (systemic) effects in people have been recorded from its bite. Bites may occasionally be medically significant.1

人にとってどれくらい危険？

人への危険: 軽いハチに刺されたくらいか、それ以下。人にはほぼ無害。

The species is not dangerous to people and is not regarded as venomous. Its bites are extremely rare, and no deaths or systemic effects have been recorded. Bites may uncommonly be medically significant.1

こわいとき、どうするの？

It flattens its neck, hisses and may make mock strikes with its mouth closed. If harassed further, it usually plays dead rather than biting.1

かまれたら

かまれたところを洗い、その人を落ちつかせて、医療の助けを受けよう。種類によっては（ブームスラングなど）何時間もあとに命にかかわることがあるよ。

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？

バナナ3本をたてにならべた長さおもちゃのブロック16こを1列にならべた長さ100 mを77秒で走れる（いちばん速い人間は9.6秒）

Western hognose snake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？

リクガメ 時速約0.3 km (0.19 mph)

Western hognose snake 時速約4.7 km (2.9 mph)

歩いている人 時速約5 km (3.1 mph)

知っておく価値あり

データ

Captive breeders have produced more than 50 'designer' colour morphs of this snake.1

In captivity, many hognose snakes refuse food for about two to three and a half months, from January to mid March, because they instinctively brumate, or sleep, underground in winter.1

Males are considerably smaller than females.1

Hatchlings reach sexual maturity after about two years, based mostly on size rather than age.1

うそ・ほんとう

うそ： Because it looks like a rattlesnake, it must be dangerous or deadly.

ほんとう： The western hognose snake is not dangerous to people. Its rare bites have not caused recorded deaths or whole-body effects, and it usually plays dead instead of biting.1

毒のエキスパート向け

学名: Heterodon nasicus
グループ: 後ろに牙のあるヘビ
家族: Colubridae2
ならびかえ: Squamata
大陸: 北アメリカ
赤ちゃん: It lays eggs. Females lay 4–23 elongate, thin-shelled eggs between June and August, which hatch after about 60 days.1
野生でのようす: Least Concern (IUCN)1
人への危険: 1 / 5: 軽い3