"But most remarkable of all is when a great bear comes to thin, freshly formed ice. The animal spreads its legs apart to distribute its weight, and if the ice still threatens to break it might lay its belly and chest on the flexing surface, perhaps using its forearms like runners, while pushing itself along in an almost swimming motion."
Boys - no squabbling, naughty step if you can't get on.
I read once that they are one of the more dangerous Zoo animals as they have no facial expressions or obvious body language which says 'I am about to rip your head off'. Personally I would have thought that staying away from them would be more sensible.