Assertion: petrel's stomach oil | /r/MadeOf | wax esters
Facets:
Source sentences:
text: They produce a stomach oil made of wax esters and triglyceride that is stored in the proventriculus.
text: They produce a stomach oil made of wax esters and triglyceride that is stored in the proventriculus.
text: During long flights, stomach oil made of wax esters and triglycerides which is stored in the proventriculus serves as energy rich food for the chicks and for adults.