North America and Canada have 6 species of cuckoo bumble bee.
For a full description of cuckoo bumble bees, their behaviours and hosts, please visit this page.
This page is about the status of cuckoo bumble bees found in North America, according to the IUCN.
The IUCN Red List Categories and Criteria are intended to be an easily and widely understood system for classifying species at high risk of global extinction.
Species that have been evaluated AND where there is sufficient data available, may fall into one of 7 IUCN Red List categories (adapted and abbreviated information from the IUCN website):
A species is presumed Extinct when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual.
EXTINCT IN THE WILD
A species is Extinct in the Wild when it is known only to survive in cultivation, in captivity or as a naturalized population (or populations) well outside the past range.
A species is Critically Endangered when the best available evidence indicates that it meets any of the criteria for the IUCN's Critically Endangered categories, and it is therefore considered to be facing an extremely high risk of extinction in the wild.
A species is Endangered when the best available evidence indicates that it meets any of the criteria for the IUCN's Endangered category, and it is therefore considered to be facing a very high risk of extinction in the wild.
A species is Vulnerable when the best available evidence indicates that it meets any of the IUCn's criteria for Vulnerable, and it is therefore considered to be facing a high risk of extinction in the wild.
A species is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for, or is feared likely to qualify for a threatened category in the near future.
A species is Least Concern when it has been evaluated against the criteria and does not qualify for Critically Endangered, Endangered, Vulnerable or Near Threatened. Widespread and abundant taxa are included in this category.
There are three bumble bees classified as 'Critically Endangered' by the IUCN, tow of 'Least Concern', and a further species that is of 'Least Concern' in North America and Europe, but classified as 'Data Deficient' overall, due to a lack of information from Asia.
Key points from the IUCN website (as of May 2018):
Bombus insularis - (Smith, 1861) - Indiscriminate Cuckoo Bumble Bee
Bombus citrinus (Smith, 1854) - Lemon Cuckoo Bumble Bee
Bombus suckleyi - (Greene, 1860) - Suckley Cuckoo Bumble Bee
Bombus bohemicus (Seidl, 1838) - Ashton's Cuckoo Bumble bee
Bombus variabilis (Cresson, 1872) - Variable Cuckoo Bumblebee
Bombus flavidus (Eversmann, 1852) - Fernald Cuckoo Bumble Bee
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