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河狸，德国 (© Andyworks/Getty Images)画面中的“建筑师”是河狸。

河狸是著名的“自然工程师”，会用树枝、泥土和石块在河流或溪流中建造水坝和巢穴。

这些结构不仅为它们提供栖息地，也会改变水流环境，为鱼类、两栖动物和湿地植物创造新的生态空间。

每年4月7日的国际河狸日，旨在致敬这位默默工作的“小工程师”。

河狸凭借一根根树枝，悄然改变着自然环境。

河狸长着标志性的门牙和桨状尾巴，以勤劳著称。

数百万年来，它们一直在重塑淡水生态环境。

河狸拥有呈橙色、富含铁质的坚硬门牙，可以轻松啃倒树木，并利用树枝和泥土建造水坝。

这些水坝能够减缓水流、改善水质，并形成湿地，从而为多种动植物提供栖息地。

它们还会用树枝和泥土搭建坚固的巢穴，入口通常位于水下，不仅能躲避捕食者，也为整个家族提供安全的居所。

作为世界上体型最大的啮齿动物之一，河狸的身体长度（不含尾巴）可接近3英尺（约90厘米）。

它们对水生环境具有出色的适应能力，一次潜水最长可达约 15 分钟。

过去，河狸曾因皮毛贸易而被大量捕猎，也常被人们误解。

但如今，它们被广泛认为是重要的生态工程师。

无论河狸在哪里定居，它们建造的水坝和湿地都会孕育出丰富的生命环境——证明即使是看似不起眼的“建筑者”，也能塑造庞大的生态系统。

International Beaver DayBeavers' orange teeth contain iron in their enamel, which makes their incisors tougher and more resistant to wear than human teeth enamel.International Beaver Day, celebrated on April 7, recognizes a hardworking little engineer quietly building a better world—one stick at a time. The beaver—buck-toothed, paddle-tailed, and famously industrious—has been reshaping freshwater landscapes for millions of years. With their iron-reinforced orange incisors, these skilled rodents cut down trees and build dams that slow the flow of water, improve its quality, and create wetlands that support a remarkable diversity of life. Their sturdy lodges, made of branches and mud, have underwater entrances that protect them from predators and keep their families safe.Among the world's largest rodents, beavers can reach nearly 3 feet in body length (excluding the tail). They are superbly adapted to aquatic life and can remain submerged for up to 15 minutes. Once heavily hunted and often misunderstood, they're now widely recognized as ecological powerhouses. Wherever they settle, these natural architects leave thriving habitats in their wake—proof that even small builders can shape big ecosystems.点击下方阅读原文，获得更多精彩内容扫码关注每日更新扫码进入微信小程序，每天0点准时更新