Assertion: bison | /r/CapableOf | rub their shoulders
Facets:
value: against boulders
type: TRANSITIVE-OBJECT
value: against tree trunks
type: TRANSITIVE-OBJECT
value: often
type: TEMPORAL
Source sentences:
text: Bison often rub their shoulders and rumps against boulders and tree trunks and also enjoy taking mud and dust baths in shallow wet or dry depressions in the soil called ‘wallows’.