They can rapidly change colors to match their background, so as to hide when frightened.
(They; can rapidly change; colors; to match their background; so as to hide when frightened) Context(They can rapidly change,List([0, 23))):(They; can rapidly change colors to match; )
They can rapidly change,List([0, 23))
They They
can rapidly change can rapidly change colors to match
colors to match their background so as to hide when frightened