Assertion: potent toxin | /r/HasProperty | secreted on the back of some frogs
Facets:
value: from granular skin glands
type: LOCATION
value: to poison darts
type: PURPOSE
Source sentences:
text: These colorful dwellers of rainforests and other warm moist climates are called poison dart frogs or poison arrow frogs because South American Indians use the potent toxin secreted from granular skin glands on the back of some frogs to poison darts used for hunting (3, 8, 10).