More than 3,500 venomous spiders – including black widows and redbacks – have been exterminated at a US military base in western Japan, alarming residents and officials already struggling with a rise in invasive species across the country. The record number of spiders, found between July and October at the US Marine Corps Air Station in Iwakuni, included three known venomous species and prompted local authorities to demand urgent action to prevent the infestation from spreading beyond the base’s...