Dr. H. O. Forbes tells of a flat spider which presents a striking
resemblance to a bird's dropping on a leaf. Years after he first
found it he was watching in a forest in the Far East when his eye fell
on a leaf before him which had been blotched by a bird. He wondered idly
why he had not seen for so long another specimen of the bird-dropping
spider (_Ornithoscatoides decipiens_), and drew the leaf towards him.
Instantaneously he got a characteristic sharp nip; it was the spider
after all! Here the colour-resemblance was enhanced by a
form-resemblance.
[Illustration: A. PROTECTIVE COLORATION OR CAMOUFLAGING, GIVING ANIMALS
A GARMENT OF INVISIBILITY
At the foot of the plate is a Nightjar, with plumage like bark and
withering leaves; to the right, resting on a branch, is shown a
Chameleon in a green phase amid green surroundings; the insects on the
reeds are Locusts; while a green Frog, merged into its surroundings,
rests on a leaf near the centre at the top of the picture.