Two years ago my husband and I were walking around outside and notice that we were right in the midst of several bees that were flying around. They did not seem at all aggressive, nor did they try to sting us. When we looked down we notice that they were coming and going from holes that were dug into the ground. They were covered in a yellow dust from the sunflower fields. We was wondering if anyone has ever heard of bees that burrow into the ground like this. Plus if we was to set up a box by their site if they might take to that instead of the ground. We have sunflowers that are still planted nearby plus alfalfa fields. We would like to start a bee hive, but don't want aggressive type of bees around, and these bees seem perfect, as to their non-aggressiveness. I can't tell much more about the bees, then what I have already descibed, but they are in the same spot every year since we first noticed them. Thanks for any advice on this.