Bombus campestris, commonly known as the field cuckoo bumblebee, is a parasitic species found across Europe. It lacks pollen baskets and relies on other bumblebee nests for reproduction. Its distinctive yellow and black coloration aids in mimicking host species, and it plays a unique role in pollination dynamics.

Bombus campestris, commonly known as the Field Cuckoo Bee, is native to Europe and parts of Asia. Its distribution spans a wide range of countries across these continents, including the United Kingdom, Ireland, France, Germany, and as far east as Russia. It is also found in some parts of Northern Africa.

Bombus campestris typically inhabits temperate regions characterized by moderate climates with distinct seasonal variations. It thrives in environments such as meadows, open grasslands, and areas with a mix of wildflowers and shrubs, where its host bumblebee species are abundant.

As a parasitic species, Bombus campestris does not construct its own nests but instead invades the nests of other bumblebee species, primarily those of the genus Bombus. It relies on these host species for reproduction, laying its eggs in their nests and depending on the host workers to rear its young. Its ecological niche is closely tied to the availability and abundance of suitable host species in its native regions.