Mud Daubers University of Maryland Extension

Mud daubers are dark, often metallic black or blue wasps. They are not aggressive.

Maryland Biodiversity Project - Pipe Organ Mud Dauber (Trypoxylon politum)

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University of Maryland Extension

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black and yellow mud dauber - Sceliphron caementarium

Wasps – Fairfax Gardening

The Surprising Life of a Gentle Mud Dauber Wasp - Humane Gardener

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Mud Dauber Identification & Habitat

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Black and Yellow Mud Dauber: Unraveling the Life of a Unique Wasp - What's That Bug?