Parotoid gland

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What Wikipedia says

The parotoid gland (alternatively, paratoid gland) is a type of external skin gland on the back, neck and shoulder of some frogs (especially toads) and salamanders, which can secrete a number of milky alkaloid substances (depending on the species) known collectively as bufotoxins, which act as neurotoxins to deter predation.

Excerpt from the Wikipedia article “Parotoid gland”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mr. Fulano, CC BY-SA 4.0, via Wikimedia Commons.