<div style="text-align: center;"><gallery mode="packed" caption="Many familiar bumblebees are Müllerian mimics, with effective stings and similar warning coloration">
File:Bombus terrestris (Buff-tailed bumblebee) - queen - Flickr - S. Rae.jpg|Bombus terrestris
File:Bombus lucorum - Centaurea scabiosa - Keila.JPG|Bombus lucorum
File:Bombus hortorum queen - Echium vulgare - Keila.jpg|Bombus hortorum
File:Tree bumblebee (RLs) (34742598795).jpg|Bombus hypnorum
Müllerian mimicry often occurs in clusters of multiple species called rings. Müllerian mimicry is not limited to butterflies, where rings are common; mimicry rings occur among Hymenoptera, such as bumblebees, and other insects, and among vertebrates including fish and coral snakes. Bumblebees Bombus are all aposematically coloured in combinations, often stripes, of black, white, yellow, and red; and all their females have stings, so they are certainly unprofitable to predators. There is evidence that several species of bumblebees in each of several areas of the world, namely the American West and East coasts, Western Europe, and Kashmir, have converged or adverged on mutually mimetic coloration patterns. Each of these areas has one to four mimicry rings, with patterns different from those in other areas.
The relationships among mimics can become complex. For example, the poison fangblenny Meiacanthus spp. have hollow canines and poison glands, and are avoided by predatory fish. The blenny Plagiotremus townsendi resembles Meiacanthus and is eaten by a variety of predators, so it is a Batesian mimic in their case: but it is avoided by the lionfish, Pterois volitans, making it also a Müllerian mimic.
Sets of associated rings are called complexes. Large complexes are known among the North American velvet ants in the genus Dasymutilla. Out of 351 species examined in one study, 336 had morphological similarities, apparently forming 8 distinct mimetic rings; 65 species in another study appeared to form six rings separable by both morphology and geography.