Background: Aggressive resemblance is used by predators or parasites. In special aggressive resemblance, the animal looks like something else, luring the prey or host to approach, for example when a flower mantis resembles a particular kind of flower, such as an orchid. In general aggressive resemblance, the predator or parasite blends in with the background, for example when a leopard is hard to see in long grass.For adventitious protection, an animal uses materials such as twigs, sand, or pieces of shell to conceal its outline, for example when a caddis fly larva builds a decorated case, or when a decorator crab decorates its back with seaweed, sponges and stones.In variable protective resemblance, an animal such as a chameleon, flatfish, squid or octopus changes its skin pattern and color using special chromatophore cells to resemble whatever background it is currently resting on (as well as for signalling).The main mechanisms to create the resemblances described by Poulton – whether in nature or in military applications – are crypsis, blending into the background so as to become hard to see (this covers both special and general resemblance); disruptive patterning, using color and pattern to break up the animal's outline, which relates mainly to general resemblance; mimesis, resembling other objects of no special interest to the observer, which relates to special resemblance; countershading, using graded color to create the illusion of flatness, which relates mainly to general resemblance; and counterillumination, producing light to match the background, notably in some species of squid.Countershading was first described by the American artist Abbott Handerson Thayer, a pioneer in the theory of animal coloration. Thayer observed that whereas a painter takes a flat canvas and uses colored paint to create the illusion of solidity by painting in shadows, animals such as deer are often darkest on their backs, becoming lighter towards the belly, creating (as zoologist Hugh Cott observed) the illusion of flatness, and against a matching background, of invisibility. Thayer's observation "Animals are painted by Nature, darkest on those parts which tend to be most lighted by the sky's light, and vice versa" is called Thayer's Law.

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using crypsis to disguise itself?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using disruptive patterning to disguise itself?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using mimesis to disguise itself?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using countershading to disguise itself?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using counterillumination to disguise itself?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using general resemblance mechanisms to disguise itself?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using a special resemblance mechanism, Species B or Species C?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using a special resemblance mechanism, Species C or Species D?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species is using a general resemblance mechanism, Species C or Species D?

Situation: Dwight is studying a new region of a rainforest that has been previously unexplored. He is observing the different species of the area and is determining the different mechanisms by which these species disguise themselves in order to hide from prey in order to correctly classify them. Dwight observes that Species A blends into the background of its surroundings to disguise itself; Species B uses color to break up the outline of its body to disguise itself; Species C is able to resemble a flower that its prey is not interested in to disguise itself; Species D is able to adjust its color to appear flat and blend in to the ground to disguise itself; and Species E is able to produce light that helps it match the background of its surroundings to disguise itself.

Question: Which species uses both general and special resemblance mechanisms?