which are also unique to these highlands. 它们也是这片高原的特有物种

49. Some groups are 800 strong
    有的甚至能达到800只
50. and they crop the high meadows like herds of wildebeest.
    如同散布在高山草场上的角马群
51. The Gelados graze alongside Walia ibex,
    站在狮尾狒身旁的是西敏羱羊
52. which are also unique to these highlands.
    它们也是这片高原的特有物种
53. These rare creatures are usually very shy
    这种罕见的动物通常很胆小
54. but they drop their guard when the Gelados are around.
    但只要狮尾狒一来到身边 它们便放松警惕
55. You might expect that grazers would avoid each other's patch
    你或许会认为食草动物 总是尽量互相避让

来自《行星地球 第一季 第二集 Planet Earth S01E02 山地》第 52 行