Oh, cats -- those furry little enigmas -- we love 'em, but can hardly understand 'em.
What exactly are our feline friends up to when we're not around? A joint study between BBC Two's Horizon programme and the Royal Veterinary College answered that question by equipping 50 cats with GPS tracking devices and micro-cameras to monitor their activity away from home.
Researchers used the trackers to record the cats' movements over six 24-hours periods, according to the BBC.
Of the 50 felines that roamed England's Surrey Hills for several weeks, 10 were selected to be featured in a Horizon series called, "The Secret Life of the Cat." You can click through each of their in-depth profiles, here; then check out the video, above, for more.
What do you think cats do while their owners are gone? Tell us in the comments, below.