.the pre-booking zoos are doing just that ( and of course are assuming that everyone has access to a smartphone or computer,and it might surprise some, but not everyone has such a thing). All spontaneity goes i.e."lets just call in at so and so should we"?...also the press ganging of being herded like sheep into doing just what Big Brother wants us to do i.e. conform to a system where everything we do is monitored and recorded. Quite simply i refuse to give in. Ill be interested to see what attitudes to" on the day" are like next year after a Winter of discontent and general hardship in the UK. This year ive visited around 50 zoos in Cyprus,Germany,Spain,France and the Czech Republic - and never been asked to pre-book once.