Tag Archives: ツノ

最後の目 The Last Eye

さあ、最後の目です。この目には帰り道、ワイオミング州の道路沿いで出会いました。Right! This is the last eye. Eye #6. We met this eye at the side of the road in Wyoming on the way back home.

北アメリカの陸上動物の中で一番の俊足と言えば、プロングホーンだという事をご存知ですか?時速80キロで走ることができると言われています。ピューマやボブキャットなどから逃げ切るために必要なスピードなんですね。6番目の目はプロングホーンでした。 Do you know that the fastest land animal in North America is the Pronghorn? It’s known that they can run over 55 mph. It’s also said that it is necessary for them to outrun Puma, Bobcat, etc. with such great speed. The #6 eye was a pronghorn’s eye.

プロングホーンのメスにも角が生えてくるようですが、大きくならないし枝分かれもしないようです。このプロングホーンは多分オスなんじゃないかと思うんです。なぜならまだ小さいですが、抜け落ちたツノの一部がまだ残っているように見えるから。(自信無いけど)Both male and female pronghorns have horns, but female horns won’t grow big, and won’t branch out like male horns. I think the pronghorn in the picture below is male because I see a tiny bit of horn remaining from the previous horn that fell off. (I have zero confidence in this though. hahaha)

こちらはメスのプロングホーン。角が小さいこともそうですが、なんと言っても乳房が見えてますからね。This one, on the other hand, I know is a female pronghorn. It’s because the horns are so tiny and I can see the swelled udder.

こっちはお母さんの後をついて歩いてる子供。 This is a cub following its mom.

プロングホーンの角は毎年ぽろりと抜け落ちるそうです。その意味ではシカの仲間のようでもありますが、なんと、抜けた後もちゃんと小さい角が残るので違うんですね。(詳しい解説はこちら)でも、角が全く抜け落ちない牛やヤギとも違う。プロングホーンの角は面白いです。 Pronghorns shed their horns and regrow them annually. From that sense, they are like the deer family, but the amazing thing is that they keep small horns even after shedding their horns. So, they keep horns like the cow family, but they also shed horns like the deer family. Isn’t it interesting? (Read the detailed description on this page.)

そこで、今回の旅で出会った角のある動物について調べてみました。 It is so interesting that I reviewed the land animals with horns or antlers that we met during the trip.


Basic fact: The horned/antler animals are mainly grouped into the cow family, and the deer family. The horns of the cow family stays on their head, and both male and female have horns. On the other hand, the antlers of deer family species fall off and regrow annually, and only the male has antlers.


Mountain Goat: This species is in the cow family, so the horns stay on their heads, and both male and female have horns. The tip of the horns are black and shiny. I wonder if they will become darker as they age. In any case, I am very happy seeing them during this trip.


Bighorn sheep: This species is also in the cow family, so the horns stay on their head, and both male and female have horns. The ram in the picture is from Valley of Fire State Park in Nevada. A growth ring is created annually on the horn, you can estimate the age of the bighorn ram.


Moose: This species is in the deer family, so only the male grows antlers, and annually sheds and regrows them. It will be my next challenge to see a bull moose.


Summary: By observing the horns, we could understand that the pronghorn is quite a unique horned animal. The scientific classification is, Antilocapridae family, Antilocaprinae subfamily, Antilocaprini tribe, Antilocapra americana. We can see them in Wyoming these days, but they nearly went extinct at one time in the past because of overhunting and land use changes. But fortunately the population recovered due to the work of many people.


Note: The horns of giraffe and rhinoceros are also very unique, but I will leave it for you as a joy of research.