Shyness depends on the deer. Some are not at all, some are. I build my own, and sell under the name Dead Deer.

In regards to bears, metal cases are bear "resistant", not bear proof. Along with chewing on the camera case, they love to stick their nails thru the sensor lens and go fishing inside the sensor. Film may attract a few more, but it has been my experience that curiosity attracts them more to both. Once they start fooling with one in a particular location, they tend to keep fooling with it each time they come by. If one messes with your cam, move it, or you are likely to end up with a totalled cam before they are thru.