Stubeanz started a very intresting thread in July 2015 - http://www.zoochat.com/38/multiple-zoo-visits-day-uk-419161/ . This is very helpfull for the UK and snowleopard has shown us what is possible in the USA but what about other countries ( the Netherlands, Belgium, Germany, Singapore and so on ) ? I normanly spend a lot of time at a single zoo but have done already quite a lot 2 zoos in one day and if I remember right 3 is my record ( Eckerförde, Gettorf and Kiel - Germany ). Thinking about the possibilities I guess it would be however very posible to visit 4 - 5 collection a day without difficulties. Alone in and around Breda and Tilburg there are 6 collections in a radius of 30 kilometers and one day I will try to visit them all in one day just to show I'm a REAL zoo-nerd ! Would like to know what your record is and which other zoo-hot-spots can provide more as 2 zoos a day.