Late one afternoon in Swaziland's Hlani Game Reserve, we were watching a giraffe come down to drink on the far side of the main dam.  After drinking for a short while, it suddenly moved away from the water and we noticed a porcupine waddling down to the water's edge.

The giraffe was clearly nervous of the porcupine and stepped backwards each time the porcupine made a threatening move.

As the stand-off slowly developed, a group a marabou storks became interested and walked over from where they had been standing a few hundred meters away.

Despite their inquisitiveness, the marabous were as nervous of the porcupine as the giraffe and were careful to keep their distance.

Eventually the porcupine moved off into the bush and the giraffe plucked enough courage to resume its drinking.