The gills of other insects are of the tracheal kind and also include both thin plates and tufted structures, and, in the larval dragon fly, the wall of the caudal end of the alimentary tract (rectum) is richly supplied with tracheae as a rectal gill. Water pumped into and out of the rectum provide oxygen to the closed tracheae.

Diatomaceous earth is used as an insecticide due to its abrasive properties. The fine powder abrades the cuticle, the waxy outer layer of insects' exoskeleton, causing them to dehydrate. In addition to insects, this also works against gastropods and is commonly employed in gardening to defeat slugs. Medical grade diatomaceous earth is sometimes used to de-worm both animals and humans.

The praying mantis has no ears on its head. It has one single ear in the middle of the thorax on the underside. This single ear, which is a deep slit inside the thorax, allows it to hear ultrasonic sounds. Since praying mantises feed during the day, they do a considerable amount of flying by night. The night, however, is when bats feed, using ultrasonic sound waves to pinpoint their prey. The frequency of these sound waves indicates the location and distance of the bat’s prey. Praying mantises are able to hear these ultrasonic sounds and when the frequency begins to increase rapidly, indicating an approaching bat, mantises will stop flying horizontally and begin a direct, high speed nose dive towards the safety of the ground.

The arctic Lion's Mane Jellyfish is considered to be the longest known living animal; the biggest specimen discovered had a bell (body) with a diameter of 2.3 m (7 feet 6 inches) and the tentacles reached 36.5 m (120 feet).

The first American monument to be dedicated to an insect was on December 11, 1919, in Enterprise Alabama. It was erected by the citizens "in profound appreciation of the Boll Weevil". The deadly destruction of cotton crops by the weevil had caused the farmers to diversify their crops, with the result that their income shortly jumped to triple the amount received in the best cotton years.