Assertion: bufflehead's size | /r/CapableOf | help to restrict the distribution
Facets:
value: to more open forests
type: TRANSITIVE-OBJECT
value: probably
type: DEGREE
Source sentences:
text: The small size of its young places them at a disadvantage, compared with larger ducks, for travelling from nest to water in areas with dense ground vegetation: this probably helps to restrict the distribution to more open forests.