Waitomo Glowworm Caves, NZ. The glow is caused by bioluminescence. 

Sources: [1] [2] [3] [4]

1 year ago | 7:09am
38 notes #glow worms #bioluminescence #caves #New Zealand #travel #tourism #ecotourism #biodiversity #interesting #awesome
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    (via TumbleOn)
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    So cool!!
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