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Every eight years during fall, a plague (số lương lớn sâu bọ độc hại tràn vào một vùng; dịch; tai hoạ) of millipedes swarm (đàn) train lines in mountainous Japan, earning them the nickname 'train millipedes'.

Working together, these small beasties (around 3 cm or 1.18 inches long) - which play a large role cycling nitrogen in Japan's larch forests (rừng thông) - have forced trains to come to a skidding halt.

Up until now, scientists weren't quite sure what was causing them to swarm with such peculiar regularity, but a 50-year research project has finally confirmed that the species - Parafontaria laminata armigera (P. l. a.) - exists on a rare eight-year life cycle.

This confirmation is incredibly exciting, as cicadas (ve sầu) are the only other known periodical animals with lifespans this long.

Bài trước: Hơn 15 quả sẽ là trọng tội đấy