Propolis

Propolis or bee glue is a resinous mixture that honey bees produce by mixing saliva and beeswax with exudate gathered from tree buds, sap flows, or other botanical sources. It is used as a sealant for unwanted open spaces in the beehive. Propolis is used for small gaps, while gaps larger than the bee space are usually filled with burr comb.

Its color varies depending on its botanical source, with dark brown as the most common.
Propolis is sticky above 19 °C (66 °F), while at lower temperatures, it becomes hard and brittle.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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Every species, image, fact, and figure is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses. No content is AI-generated.