He was exploring a cave when his dog ran away. He looks at photos later and understood why

Michael Glidden was out exploring ice caves with his dogs. Naturally, he took pictures. When he went to one particularly cave, one of his dogs ran away, but Glidden stayed and continued taking pictures.

When he looked at the photos later, he realized why his dog ran away. His photos revealed a hibernating bear in the cave. I bet he stayed away from caves for a while.