Assertion: flea's host | /r/HasProperty | mammal
Facets:
value: usually
type: DEGREE
Source sentences:
text: This parasite feeds upon the blood of a host, usually a mammal.
text: Six-legged larvae hatch from the eggs, move up on blades of grass, and wait for a suitable host (usually a mammal) to pass by.
text: They most likely evolved with mammal hosts, only later moving to birds.