The best guess anyone has is that the cubs were born on May 10, judging from when Dora was last seen (May 6) and when she reappeared for some food (May 11). And while everyone headed for the clearly dug-out den at the northwest corner of the enclosure –a fence was set up to keep giddy visitors a little farther from the “den” – my first glimpse of the new Mama (pictured here at right) came in an entirely different area of the domain.