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Horses are used in ecotourism activities to carry tourists to the Mount Pinatubo caldera rim (top). These alien herbivores may be influencing invasive plant expansion by vectoring seeds to these remote habitats. Aeta woman prepares wild-harvested Thysanolaena maxima panicles for sale (bottom). The opportunistic harvesting of these panicles in Mount Pinatubo habitats under pressure from human traffic may explain spatial patterns of this large grass.
