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The limited food and space on small islands can often lead to intense competition.
島嶼上有限的食物和空間時常激起激烈的競爭。
But some islands are immense.
但有些島嶼卻幅員遼闊。
More like miniature continents.
更像是一塊小型大陸。
And these provide opportunities for life to experiment and evolve.
這為不同生命的進(jìn)化與試驗(yàn)提供了機(jī)會。
Madagascar is one of the biggest islands and also one of the oldest,
馬達(dá)加斯加是地球上最大的島嶼之一，也是最古老的島嶼之一，
having split away from Africa over 120 million years ago.
它在一億兩千萬年前就已經(jīng)脫離非洲大陸。
With time and isolation,
隨著時間流逝與地理隔斷的出現(xiàn)，
its animals have adapted to take advantage of every available niche.
島上的動物們不斷適應(yīng)充分利用一切可用資源。
The island now has some 250,000 different species, most found nowhere else on Earth.
這座島上現(xiàn)存約二十五萬不同的物種，大部分都是該地區(qū)特有種。
These are not monkeys, but lemurs.
這些不是猴子，而是狐猴。
From a single ancestor, about 100 different types have evolved.
他們從同一個祖先進(jìn)化出一百個不同的種。
