Assertion: octopus | /r/CapableOf | change the color of its skin
Facets:
Source sentences:
text: By contracting or expanding tiny pigment-containing sacs within cells an octopus can change the color of its skin, giving it the ability to blend into the environment.
text: By contracting or expanding tiny pigment-containing sacs within cells known as chromatophores, an octopus can change the color of its skin, giving it the ability to blend into the environment.