...expressions when they are in pain. For the study, the ill-fated mice were videotaped after experimenters injected noxious chemicals into their abdomens, ankles, hands and feet; placed them on hot plates; placed their tails in hot water; clamped...

...hairs on their wings and allow the caddisfly to escape the sticky web. Some insects, including stinkbugs, spray noxious chemicals when attacked by a predator. Certain spiders bite their prey before wrapping it up in silk and thus get sprayed...

...when pestered, and the repulsiveness of this juice depends on what they have been eating; their natural foods add noxious chemicals that the grasshoppers recycle, but the vomit of grasshoppers fed on lettuce lacks this useful repulsiveness. Plant...