Butterflies of Sumatra

A huge island, dominated, on the southern part, by the mountain range of the Pegunungan Barisian. This island is considerably more forested than neighbouring Java, and most of the species and subspecies found here are endemic to the Island. The surrounding islands also generally have their own endemic subspecies.

Although the Equator is a purely human invention, it is surprising how many subspecies seem to be only found either to the north or to the south, with only a small cross-over area.

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