By contrast, the biggest mammal that ever walked on land was the hornless rhinoceros known as Paraceratherium.

之下，曾经在陆地上行走过的最大的哺乳动物是被称为 Paraceratherium 的无犀牛。

Some male tunnelers avoid the fray by masquerading as hornless females and sneaking into tunnels to mate while the guardians' heads are turned.

些雄性挖道蜣会扮成无雌蜣来避免争斗，并在守卫蜣不注意时，悄悄溜进通道进行交配。

But there were abundant remains of one species of dinosaur from the same fossil formation: Protoceratops, a small, hornless ceratopsian.

但是，同化石地层中有种恐的大量遗骸：原，种小型无。

Some places are so desperate to protect their rhinos that they will tranquilize them and carefully remove their horns in the hope that poachers will leave these hornless rhinos alone.

有些地方为了保护犀牛，孤注掷，他们会麻醉犀牛，然后小心翼翼地取走犀牛，希望偷猎者能放过这些无犀牛。