Assertion: feather's bird | /r/CapableOf | show external signs of the disease
Facets:
Source sentences:
text: In 15 individuals the virus for PBFD (psittacine beak and feather disease) was detected, but only two birds showed external signs of the disease -- abnormal feather formation and/or coloration, loss of feathers and feathers with blood in the quill (haemorrhagic).