Venom is any of a variety of
toxins[1] used by certain types of
animals. Generally, venom is injected by such means as a bite or a sting.
[2]There is a difference between organisms that are venomous and those that are poisonous,[3] two commonly confused terms applied to plant and animal life.
The slow loris, a primate, blurs the boundary between poisonous and venomous. From patches on the inside of its elbows it secretes a toxin, which it is believed to smear on its young to prevent them from being eaten; however, it will also lick these patches, giving it a venomous bite.
Among animals using venom are spiders and centipedes, which also inject venom through fangs; scorpions and stinging insects, which inject venom with a sting (which, in insects such as bees and wasps, is a modified egg-laying device – the ovipositor). Many caterpillars have defensive venom glands associated with specialized bristles on the body, known as urticating hairs, and can be lethal to humans (e.g., that of the Lonomia moth).