这些独特的生物是什么？(What are these unique creatures?)

冰岛马是在冰岛发现的一种小型马。由于严格的规定，冰岛马至今仍保持纯种。来自世界各地的马术运动员访问冰岛，以获得更多关于这一独特品种的知识。冰岛法规还禁止将马匹进口到该国，一旦出口，它们就不能再回来。这主要是为了防止疾病在马匹之间传播。冰岛马的颜色多种多样，如灰色、黑色、栗色、马鬃色等等。这些马通常只有在四岁之后才能骑，主要用于表演、比赛和休闲活动。
原文：
The Icelandic horse is a small-sized breed of horses found in Iceland. Due to strict regulations, Icelandic horses remain purebred to this day. Equestrians from all over the world visit Iceland to gain more knowledge about this unique breed. Icelandic regulations also prohibit importing horses into the country and once exported, they cannot come back. This is done mainly to prevent disease-spreading amongst the horses. Icelandic horses come in a stunning variety of colors like gray, black, chestnut, roan, and more. These horses are usually only ridden after they turn four and mainly used for showing, racing, and leisure activities.
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