You're camping, and it's dusk. As you gather firewood, one of the sticks moves. It's not a stick. It's deadly black mamba.  The snake raises its head more than 1 m (4 ft) off the ground. It strikes like lightning, attacking you again and again, then slithers away.  What could you do to survive? Are black mambas black all over their bodies? Do these snakes hang out alone or travel in groups? And how fast can you die from a black mamba's venom?