Imagine a waterhole on the plains of Africa. Now imagine that each buffalo drinking there is a photographer, and that the water is their livelihood. Now backtrack 25 years and picture the scene. Every few days a buffalo wanders by and takes a leisurely drink. The water is clean and plentiful, the mood of the savannah calm and tranquil. A few years on and more animals start to drink; there’s still enough water to go around but the buffalo are more fractious; conscious of the dwindling supply. Fast-forward to the present day and the times of plenty have disappeared. The buffalo arrive in large herds all eager to quench their thirst but the demand for water exceeds the amount available, and desperate to sustain themselves, the herds scatter to eke out an existence from tiny, drying pools. This is modern day nature photography.