Scorpion and ticks belong to class Arachnida of phylum Arthropoda. The scorpions are Venomous arthropod and feeds on insects, worm, spider etc. Ticks are ectoparasites of vertebrates and provided with blood sucking mouth parts. Scorpion respires through book lungs. Cockroachs belong to class-Insecta. These are terrestrial nocturnal arthropods showing sexual dimorphism. Hermit crab belongs to class-Crustacea. Hermitcrab and sea anemone often form a close association termed Conunensalism.