Assertion: black mamba | /r/CapableOf | derive their name
Facets:
value: from the inside of their mouth
type: TRANSITIVE-OBJECT
Source sentences:
text: Black mambas, which have grey or olive skin, actually derive their name from the striking, blueish black colour of the inside of their mouths.
text: Although their skin is olive green or shades of grey, they derive their name from the inside of their mouth which is totally black.