In fulmars, the proventriculus is very baggy, and has thick wrinkled walls lined with glands that excrete the waxy oil which courting birds pass to one another in small amounts, perhaps as a way of scent-marking their mate.
Source: wiktionary
Proventriculus
Synonyms for "proventriculus"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.