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.
बहुत - से कीड़े सिर्फ पौधे खाकर जीते हैं जबकि कुछ कीड़े, दूसरे कीड़े - मकोड़ों को खाते हैं ।