Fluids have built up in the brain of brown bear Boki. He needs surgery because of this, otherwise "he would not survive the winter", his caretakers said. More for You.

A brown bear that underwent brain surgery in the first operation of its kind in the UK is doing well, but "not out of the woods" yet, said the charity caring for him.

A human brain weighs in at about 1,500 grams, huge compared to a 450-gram bear brain. And yet our olfactory bulb is the size of a pencil eraser. The bear's is the size of your thumb.

March 13 (UPI) --A zoo in England said the first brown bear to undergo brain surgery has awakened from hibernation and appears to be back to his old self.The Wildwood Trust said the bear, named ...

LONDON – A bear cub that underwent pioneering life-saving brain surgery has come out of hibernation and appears to have made a “remarkable” recovery, British zoo chiefs said on March 13.

A bear cub that underwent pioneering life-saving brain surgery has come out of hibernation and appears to have made a "remarkable" recovery, UK zoo chiefs said on Thursday.

Boki, the first brown bear to have brain surgery, making ‘remarkable’ recovery after breakthrough case. He’s looking ‘brilliant, happy and healthy’ following the development, keepers say ...

The forensic necropsy of the bear cub corpse Robert F. Kennedy stashed in Central Park 10 years ago found that much of its brain leaked out of its mouth.