Assertion: honey buzzard's feather | /r/CapableOf | call tectrix
Facets:
Source sentences:
text: The calami of the flight feathers are protected by a layer of non-flight feathers called covert feathers or tectrices (singular tectrix), at least one layer of them both above and beneath the flight feathers of the wings as well as above and below the rectrices of the tail.