A worker and a queen Buff-tailed Bumblebee (Bombus terrestris) on a Sedum spectable flower head. The queen is the larger bee and the size difference Stock Photo - Alamy
Flight of the Bumblebees | Michigan Tech Magazines
Figure 5. Size range of Bombus huntii. An overwintered queen is on the left. Bumble Bees - Bugwoodwiki | Bumble bee nest, Bee, Bumble bee
Multi-stripped bee, size of a bumblebee - Bombus borealis - BugGuide.Net
Urban Pollinators: Identifying common bumblebee queens