Assertion: boa constrictor's diet | /r/MadeOf | bird
Facets:
value: mainly
type: DEGREE
Source sentences:
text: Boa imperator, like most Boa species, has a varied diet that consists mainly of rodents, birds, lizards and frogs.  
text: Previously, it had been thought that the primary diet consisted of birds.
text: This species is an ambush predator, with a diet consisting mainly of terrestrial vertebrates such as mammals and birds, as well as domestic poultry, which are all killed by constriction.