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Additionally, these insects tend to be relatively large, long-lived, active, and frequently aggregate. [2] Indeed, longer-lived insects are more likely to be chemically defended than short lived ones, as longevity increases apparency. [9] Throughout the arthropod and insect realm, however, chemical defenses are quite unevenly distributed.
Phasmatodea species exhibit mechanisms for defense from predators that prevent an attack from happening in the first place (primary defense), and defenses that are deployed after an attack has been initiated (secondary defense). [14] The defense mechanism most readily identifiable with Phasmatodea is camouflage, in the form of a plant mimicry.
Insects accordingly employ multiple defensive strategies, including camouflage, mimicry, toxicity and active defense. [138] Many insects rely on camouflage to avoid being noticed by their predators or prey. [139] It is common among leaf beetles and weevils that feed on wood or vegetation. [138] Stick insects mimic the forms of sticks and leaves ...
Insects use aggregation pheromones for defense against predators, in mate choice, and to overcome host plant resistance to mass attack. A group of individuals at a site is referred to as an aggregation , regardless of sex. [ 64 ]
Production of allomones is a common form of defense against predators, particularly by plant species against insect herbivores. In addition to defense, allomones are also used by organisms to obtain their prey or to hinder any surrounding competitors.
Many insects acquire toxins from their food plants; Danaus caterpillars accumulate toxic cardenolides from milkweeds (Asclepiadaceae). [56] Some prey animals are able to eject noxious materials to deter predators actively. The bombardier beetle has specialized glands on the tip of its abdomen that allows it to direct a toxic spray towards ...
This potential, however, can hinge on a number of the insect's traits. For example, hemipteran predators can use their sucking mouthparts to make use of leaves, stems, and fruits, but spiders with chelicerae cannot. [17] Still, insects widely considered to be purely carnivorous have been observed to diverge from expected feeding behavior. [18]
A worker can explode suicidally and aggressively as an ultimate act of defense, an ability it has in common with several other species in this genus and a few other insects. [1] The ant has an enormously enlarged mandibular gland, many times the size of other ants, which produces adhesive secretions for defense. [2]
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