Bombus occidentalis - Wikipedia

List of bumblebee species - Wikipedia

ARCHIVE - Bombus occidentalis - ize2010

List of bumblebee species - Wikipedia

The Buzz: Protecting Our Bumble Bees - Bug Squad - ANR Blogs

ARCHIVE - Bombus occidentalis - ize2010

Bumblebee - Wikipedia

Rearing Bumble Bees for Research and Profit: Practical and Ethical Considerations

The Day the First Bumble Bee Arrived - Bug Squad - ANR Blogs

Bumblebee - Wikipedia