We have named one million types of insect but think there are four million more. The world is populated, primarily, by these small and often irritating beasts. Ants alone outnumber us by a million to one and the weight of ants in the world is greater than the weight of humans.
Best of all, insects are bewilderingly, heart-liftingly crazy. The bombardier beetle crawls around with a bottom full of chemicals that can react explosively and destroy predators. A type of termite does something similar, but in an act of suicidal altruism it blows itself up in the process.