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.

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 ...

Robert F. Kennedy Jr. posed with the dead bear cub he found, sticking his hand in its mouth. That's where much of its brain leaked, according to a necropsy obtained by BI. RFK Jr. and the bear may ...