In a quiet but consequential step forward for veterinary science, researchers at the Horse Microbiome Research Group have demonstrated that a portable, USB-sized sequencing device can rapidly map the distinct bacterial communities living across a horse's body — from gut to skin to milk. The work, rooted in a study of how foals inherit their microbiomes from their mothers, suggests that the complex inner ecology of animals need no longer be the exclusive domain of large, well-funded laboratories. What was once a slow and costly cartography of the microbial world is becoming something closer to