Lots of natural bees have been dying out for many reasons, its very sad, but nice to hear that your looking for bees. In Alberta here there was a report that said we lost huge amounts of bees, I think its mostly because of all the frankenfood out there, plants that were never meant to exist in nature, created in a lab .... read too much about that!
When I built my first pond in the early 90's, I used to have lots of bees, used to have a real "bee line" to the pond and if you were standing the way, they would bounce off you. I had bee hives everywhere, under the steps, in the crack of rocks by the pond, in the front porch... now there just gone mostly. There are some small type and bumble bees still, but very very few honey bees left. It's quite sad. Albert Einstein once said, "no more bees, no more trees, no more trees, no more plants, no more plants, no more animals, no more animals, no more man....