it's a turf war between man and beast. >> i think they just pushed -- caved it in pretty much like that and it fell in on the living room floor. >> rich rosa is among the growing number of lake tahoe residents who have encountered a hungry bear busting down the door to raid the bridge. >> when i came out i saw the bear running through the house. >> where there is people there is food higher in calories human food provides more energy to produce more cubs. statistics show the number of black bears around lake tahoe has doubled over the past decade. wildlife officials in california and nevada who have had to kill two dozen so-called nuisance bears this year say now the people have gotten serious about securing their trash, the animals have taken to breaking. >> they are after what you have. just like a thief would be, you know. it wants what's in your house. >> the owners of this vacation property aren't taking any chances after a bear turned it into his winter den and trashed the place.