Mimicry and Camouflage Honor

Nature Study

Requirements

1. What is mimicry, what is camouflage, and what are they for?

   Answer: 1) What mimicry is: it is when an organism imitates the appearance of another species or of an object (color, shape, sound, or behavior) to deceive predators, prey, or partners. 2) What camouflage is: it is the strategy of blending in with the environment (colors, patterns, and texture) to go unnoticed. 3) What they are for: both serve for survival — defense against predators, hunting by surprise (ambush), and reproduction. — In evolutionary biology, mimicry (imitation of another living or apparent being/object) is distinguished from crypsis/camouflage (visual fusion with the substrate/environment). Batesian mimicry: a harmless species imitates a venomous species (the false coral snake imitates the true coral snake). Müllerian mimicry: two toxic species converge visually. Disruptive camouflage: patterns break up the silhouette (the zebra). Camouflage by mimesis: imitating objects (leaves, twigs). Both are Darwinian adaptations selected by predation pressure over generations.

2. Cite at least one example of mimicry for each:
   • Insects;
   • Birds;
   • Reptiles.

   Answer: 1) Insects: the owl butterfly (Caligo) has large spots on its wings that imitate owl eyes, scaring off predators. 2) Birds: the cuckoo (Cuculus canorus) lays eggs that imitate those of other birds, tricking them into hatching its chicks. 3) Reptiles: the false coral snake (Lampropeltis) imitates the colors of the venomous true coral snake, gaining protection without having venom. — These are classic examples of mimicry. The owl butterfly is a case of intra-class defensive mimicry (it imitates another animal with large eyes). The European cuckoo is an example of brood parasitism with egg mimicry: the female evolves eggs whose color and pattern match the eggs of the host species (reed warbler, flycatcher). The false coral snake is the best-known Brazilian example of Batesian mimicry: Erythrolamprus and Lampropeltis copy the black-red-white/yellow pattern of the true coral snakes (Micrurus).

3. Give at least one example of camouflage for each:
   • Insects;
   • Reptiles;
   • Marine animals.

   Answer: 1) Insects: the stick insect (Phasmida) has a body just like a twig, and the leaf moth imitates a dry leaf, blending in with the vegetation. 2) Reptiles: the chameleon changes color according to the environment, and the vine snake (Oxybelis) blends in with branches and vines. 3) Marine animals: the octopus (Octopus) changes color and texture instantly, the flounder becomes identical to the sandy bottom, and the pygmy seahorse copies the coral in which it lives. — Camouflage by crypsis aims at non-detection. The stick insect is an emblematic example of mimesis (imitating part of the environment). Chameleons alter chromatophores for thermal regulation and communication, with camouflage as a secondary effect. Octopuses (especially Octopus vulgaris) have direct nervous control over chromatophores, leucophores, and iridophores, reproducing patterns and texture in seconds. Flounders (Bothidae) use photosensitive cells in the skin. Pygmy seahorses (Hippocampus bargibanti) live in Muricella corals and copy them perfectly.

4. Answer the following questions:
   • What is the advantage to the false coral snake of having colors practically identical to those of the true coral snake?
   • In the animal world, which are the kings of camouflage on land and in the sea?
   • What is the shape of the eggs of the stick insect (Phibalosoma Phyllinum)?
   • How do insects specialized in mimicry walk?
   • What are the advantages and disadvantages of insects that resemble leaves?
   • How does the assassin bug (Acanthaspis petax) hide from predators?

   Answer: 1) The false coral snake displays colors practically identical to those of the true coral snake, but it has no venom. This imitation (Batesian mimicry) deceives predators, which have learned to avoid the venomous true coral snake; by confusing the two, the predator leaves the false coral snake alone, ensuring its protection without the cost of producing venom. 2) In the sea, the king of camouflage is the mimic octopus, capable of changing color, texture, and shape to imitate other animals and the environment. On land, the king is the chameleon, which alters the color of its skin to blend in with the surroundings (besides communication and thermoregulation). 3) The eggs of the stick insect (Phibalosoma phyllinum) have a shape resembling seeds or plant grains, with a hard shell and discreet coloring, going unnoticed on the ground among leaves and debris, which protects the next generation. 4) Insects specialized in mimicry walk in a slow, swaying manner, oscillating their body like a leaf or a twig moved by the wind. This rhythmic movement reinforces the illusion that they are part of the vegetation, not an animal. 5) Advantages: the resemblance to leaves offers excellent camouflage, hiding the insect from predators and making it easier to ambush prey. Disadvantages: the flattened shape and the appendages that imitate leaves limit mobility and speed, making the insect slower and more vulnerable when it is discovered. 6) The assassin bug (Acanthaspis petax) covers its own body with the carcasses (dead ants) of its prey, forming a 'pile' that disguises its shape and its smell. This accumulation confuses predators, which do not recognize the insect, serving as camouflage and a shield. — The false coral snake (Lampropeltis, Erythrolamprus) is a classic example of Batesian mimicry. The mimic octopus (Thaumoctopus mimicus) imitates fish and venomous snakes; the chameleon switches colors. The stick insect (Phibalosoma phyllinum) lays eggs with a hard capsule resembling seeds, and ants get confused and carry them to their nests, dispersing them. The swaying (rocking) walk imitates the movement of a leaf in the wind. The assassin bug (Acanthaspis petax) covers its back with dead ants — an effective chemical and visual disguise against predatory spiders.

5. Give examples of animals that display characteristics contrary to mimicry, and explain why this happens in nature.

   Answer: Animals with aposematism (bright colors) such as poison dart frogs, bees, ladybugs, wasps, skunks, and coral snakes use strong contrast to WARN predators of poison or bad taste. Instead of hiding, they show themselves off. Predators learn to avoid these colors, granting evolutionary protection to the species. — Aposematism is warning coloration. Poison dart frogs (Dendrobatidae) of the Amazon store lethal alkaloids and display blue, red, yellow, and black. Bees and wasps use black and yellow. Ladybugs (Coccinellidae) release toxic reflex-bleeding. Striped skunks emit a repugnant odor. Predators that try to eat them learn quickly; some animals are even born with an innate aversion to these colors. It is an honest signal in evolution: 'I am dangerous, it's not worth the risk' — the evolutionary opposite of cryptic mimicry.

6. Illustrate the mimicry of the following species:
   • Orchid mantis (Hymenopus coronatus);
   • Common potoo (Nyctibius griseus);
   • Horned frog or leaf frog (Proceratophrys boiei).

   Answer: Orchid mantis: white-pink color and petal-shaped legs, imitating orchid flowers to attract pollinators as prey. Common potoo: gray plumage and an upright posture on the branch, pretending to be a broken trunk. Horned frog: skin with eye horns and a dead-leaf pattern. — Hymenopus coronatus, from Southeast Asia, is a case of 'aggressive mimicry' — it imitates a flower to attract pollinating insects that will be devoured. Studies show that it attracts more pollinators than real flowers. Nyctibius griseus, from South America, perches motionless on top of broken trunks during the day, with plumage indistinguishable from the bark; it hunts only at night. Proceratophrys boiei lives in the leaf litter of the Brazilian Atlantic Forest; its eye horns and back pattern perfectly imitate dry leaves.

7. Watch videos or look at photographs/images that document the camouflage of the following species:
   • Mimic octopus;
   • Goniurellia tridens;
   • Lantern fly (Fulgora laternaria).

   Answer: Mimic octopus: changes color, pattern, and shape to imitate lionfish, sea snakes, and flounders, depending on the predator. Goniurellia tridens (a fly): wings with a pattern that imitates an attacking spider, scaring off real spiders. Lantern fly (Fulgora laternaria): a bulky head with markings that imitate the eyes and teeth of a reptile, scaring off predatory birds. — The mimic octopus (Thaumoctopus mimicus, discovered in 1998 in Indonesia) is the only known animal capable of imitating more than one different species. Goniurellia tridens, a fly from Arabia, has a detailed illustration of a spider on each wing — a drawing of eight legs, a cephalothorax, an abdomen, and an angle of attack. The lantern fly (Fulgora laternaria), a South American insect, is traditionally mistaken for a snake or alligator because of its cranial pattern; false eyes and teeth on its large head cause predators to back away.