If insects aren't considered animals than that means, crabs, spiders, centipedes, sponges, jellyfish or any invertebrates aren't considered animals either. Sorry too disappoint but all of these creatures ARE animals. read more
According to Wikipedia, insects belong to "the most diverse groups of animals on the planet, including more than a million described species." Most of these species are insects. Other species of the Arthropoda phylum include crabs and lobsters. Insects can be aquatic or terrestrial, while many species of insects have adapted to flight. read more