Many wild bee species like blue orchard bees (Osmia lignaria) are solitary and make their nests in natural cavities or, as shown here, at an artificial nest. Note the nest tunnels capped with mud. (Photo credit: Derek Artz, Ph.D.) Leave a Reply Cancel reply Search Search for... Search Get New Posts in your Inbox! Enter your email address to subscribe to Entomology Today. You'll receive notifications of new posts by email. Email Address Get Certified!