Came across this old clip ( 1964 ) of Rotterdam Zoo in spring -nice to see that some species are still at the same place at the zoo and that even the enclosures arestill recognizeble ! : Voorjaar in Diergaarde Blijdorp in Beeld en Geluid Version: 0.28
Found also some videos of the now closed Tilburgse dierentuin : https://www.youtube.com/watch?v=uQDiEd76EpE ( 1973 , bad quality ) https://www.youtube.com/watch?v=IgPOQChElV0 ( 1973 - part 2 ) https://www.youtube.com/watch?v=PijB1M4oV7s ( song in an unsuccesfull attemp to save the zoo ).
Here's another Tilburg film, from the 1930s (and quite decent in its quality): https://www.youtube.com/watch?v=o2JpHT6RU8w
Very old ( 1935) movie about a school-trip to the now closed Den Haag Zoo : https://www.youtube.com/watch?v=7QpKSocg1ww
Bronx zoo and Andy's Animal Alphabet-1950 https://www.youtube.com/watch?v=Ncfrf3Yd_5g (And a zoochatter commenting!)
One of the first movies of Avifauna - Alphen a/d Rijn, the Netherlands, begin 1950-ties : Tijd voor Nostalgie - - Omroep West