(Portland, OR)  --  Oregon wildlife officials say a black bear was put down because park-goers wouldn't stop taking selfies with him.  Portland biologists shot and killed the young animal when he was seen eating human snacks near a park entrance.  Local law enforcement said they feared he could become a danger to people by becoming comfortable with humans, caused by the selfies and those who fed him.  Wildlife experts say the incident shows why people should not feed bears or invade their habitats.