According to Robert Brandon's rigorous account of adaptation, this is to say that the black color is an adaptation, and that it is for camouflage.
(this; is; to say that the black color is an adaptation, and that it is for camouflage) (it; is; for camouflage)
this it
is is
to say that the black color is an adaptation, and that it is for camouflage
for camouflage