Cockroaches and water bugs have a completely different set of habitats and are grouped under different orders. While cockroaches fall under Blattaria, water bugs are grouped under Hemiptera.
Cockroaches appear as flat broad creatures. They have compound eyes helping them view numerous objects at once. This is a great defense mechanism helping cockroaches escape when they see any type of danger lurking from any angle. They love to hide in crevices that are slender enough just to let themselves in. They are mostly nocturnal and shy away from light. They have 1 pair of wings placed under a hard protective outer covering. Long pair of antennas helps in movement. They live in groups and are predominantly found on land. They eat plants, animals, wooden pieces, food items, etc. Their method of reproduction is very interesting. The males have a unique way of attracting females. They sing to attract female partners.
Water bugs on the other hand are aquatic in nature. They come on land just to breathe and then go back underwater. They are round and have a waxy cuticle that is waterproof. Their antennas are safely kept inside the head of the bug. Wings are also placed underneath the hard protective casings. They are smaller in size when compared to cockroaches. A few species do not have eyes while others have very small ones. They feed on insects, fishes and other sea creatures. A few others relish fruit juices and plant parts. They act as if they are dead when they sense danger. Sometimes, they can even cause wounds and injures to predators. Gangrene and blood poisoning is inevitable. They are not socialistic like cockroaches.
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