Prickly plants with wicked thorns, spines, or serrated leaves can often serve as operative deterrents since any accidental ...

The common mechanical plant irritants include thorns, spines, glochids, trichomes, and sharp-edged leaves. Many chemical irritants have yet to be elucidated, but known culprits include calcium ...

Meet the crown-of-thorns starfish. But don t ever touch one. This huge, 18-inch-wide starfish comes covered in sharp venomous spines that can land you in the hospital if you tried to pick one up ...