OK, an aside about ravens. When my hubby and I went to Yellowstone Park in February, we were forewarned not to leave any food items or wrappers in our snowmobiles. My understanding is they have a tremendous sense of smell. We witnessed the ravens opening the locked trunks and pulling items out. We saw the destruction the birds caused to one machine, when it could not get the lock open, it tunnelled its way through the seat to trunk to get food out. Nasty birds!