VENOMOUS SNAKES: Have special glands and teeth designed to
inject venom into their prey.
There are around 700 different species of venomous snakes.
Around 250 of these are capable of killing a human with one bite.
As well as for attacking prey, snakes also use venom in self defence.
The venom is typically delivered by injection using hollow or grooved
fangs, although some venomous snakes lack well-developed fangs