Skin-crawling footage shows tiny bark lice travelling on a shrub together in Sullivan, Missouri, on July 2.<br /><br />An adult bark louse also crawls and follows the herd of nymphs travelling the bush.<br /><br />Insect enthusiast Eva Wiedeman said she found the little creatures while walking in the garden.<br /><br />She said: "I always go outside to look for insects, then I saw these creatures together."<br /><br />Also called tree cattle, bark lice exhibit the fascinating behaviour of moving in groups, somewhat like a flock of sheep or herd of cattle.
