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Two-form Bumblebee (Bombus bifarius)

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description Two-form Bumblebee (Bombus bifarius) Overview

The two-form bumblebee, Bombus bifarius, is a social bee native to western North America, where it occurs in mountain, woodland, meadow, and related habitats. Colonies are founded by overwintered queens and later contain female workers and reproductive individuals. The species has geographically variable abdominal coloration, including red-banded and black forms, and this variation has contributed to historical difficulty in distinguishing populations and related taxa.

help Two-form Bumblebee (Bombus bifarius) FAQ

Why is Bombus bifarius called the two-form bumblebee?

Bombus bifarius is known for having two major color forms across its range. The name reflects that visible variation, which can make individuals look noticeably different from one another.

Where does Bombus bifarius live?

It is native to western North America. The species occurs in habitats including mountains, woodlands, meadows, and related upland environments.

How does a Bombus bifarius colony begin?

A colony is founded by an overwintered queen in spring or the local equivalent of the colony-starting season. The colony later contains female workers and reproductive individuals.

Is Bombus bifarius a solitary bee?

No. It is a social bumblebee whose colonies contain a queen, workers, and later reproductive bees. That social life cycle is different from solitary bee species that raise offspring independently.

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