Lusitanian flora and fauna

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A perplexing group of species occur both in Iberia and South-west Ireland. In Ireland they were thought to perhaps have survived the last ice age in a refuge and then expanded. Recent research shows many of these a species were probably introduced by humans, sometimes in in prehistory. The strawberry tree (Arbutus unedo) is the most famous member of this group and seems to have been introduced by humans 4000 years ago to provide wood for copper smelting.

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