Over several years, Heidy Kikillus attached tiny GPS collars to cats and recorded their movements. Each cat wore the collar for a week, so Heidy and her colleagues could better understand feline behaviour.
Like tiny tangles of wool, the squiggles on this page show where Marmite, Zeus, Smudgy Bum and 100 other cats ventured over seven days. Some cats are homebodies, rarely venturing beyond their own backyard. Others roam suburban streets and parks, travelling over half a kilometre from home. The most mobile cat lives in a rural area, which is not shown on the map, and travelled 2.25 kilometres from home.