Colymbiformes is a disused order of birds that was once used to classify grebes and loons. Scientific study has revealed that these two types of waterbirds are not so closely related; they have been reclassified in the orders Podicipediformes and Gaviiformes, respectively.
- "Colymbiformes". Encyclopædia Britannica. 2005. Encyclopædia Britannica Premium Service.
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