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