Assertion: petrel's flight | /r/MadeOf | pair
Facets:
Source sentences:
text: The species is thought to mate for life (like other Procellariiformes); pairs undertake mating flights consisting of pairs chasing and calling at each other over the colony prior to laying.
text: The species is thought to mate for life (like other Procellariiformes); pairs undertake mating flights consisting of pairs chasing and calling at each other over the colony prior to laying.