People commonly use the term “insect ” to include not only true insects ​ — six - legged creatures such as flies, fleas, mosquitoes, lice, and beetles — ​ but also eight - legged creatures such as mites and ticks.
अनेक कीटक केवळ वनस्पतींवर गुजराण करतात तर काही कीटक इतर कीटकांना खातात.