From MSNBC:
Ants don't march in predictable patterns to search for crumbs, as you might have thought by watching them. Instead, new research suggests they roam randomly.
This is not a matter of ant versus human intelligence, because a seemingly blind search can still make sense in both practical and mathematical terms.
“The beauty of a mathematical random walk is that it eventually visits all points in space if you walk long enough — and it always returns to its starting point,” said William Baxter, an experimental physicist at Penn State Erie, The Behrend College.
More here.