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Bombus ashtoni

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description Bombus ashtoni Overview

Bombus ashtoni, known as Ashton's cuckoo bumblebee, is a social parasite native to North America that reproduces by usurping the nests of other bumblebee species, primarily Bombus terricola and Bombus affinis. The species has experienced severe population declines and is considered critically endangered or possibly extinct, closely tracking the collapse of its host species across its historic range in the northeastern United States and eastern Canada. Unlike nest-building bumblebees, cuckoo species lack worker castes and produce only reproductive males and queens.

help Bombus ashtoni FAQ

How does the Ashton's cuckoo bumblebee reproduce?

This critically endangered North American bee reproduces by invading the established nests of other bumblebee species. The female will sneak into the nest, kill the resident queen, and force the worker bees to raise her own offspring.

Is Bombus ashtoni endangered?

Yes, Bombus ashtoni, commonly known as Ashton's cuckoo bumblebee, is currently listed as critically endangered. Its populations have drastically declined across North America over the last few decades.

What is causing the decline of Ashton's cuckoo bumblebee?

The primary cause of its decline is the rapid loss of its host species, such as the rusty-patched bumblebee. Because it is an obligate social parasite, it cannot survive if its host bee populations disappear.

Where in North America was Bombus ashtoni historically found?

Historically, the bee was widely distributed across the northeastern United States and eastern Canada. Today, confirmed sightings are incredibly rare, and it is feared to be nearing extinction in the wild.

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