Exotic reptiles kept outdoors in Europe

London Zoo’s outdoor Reptilary, just inside the Main Gate, was built in 1927; it was originally called the Reptile Rock Garden and was swept away as part of the Sobell Pavilions development.

As you mention, it mainly housed European species (I recall both adders and grass snakes there in the 1960s) but on very hot days tropical chameleons were placed in the trees.
No way would resident Herring Gulls allow that these days.
 
Indian gharials in Prague zoo have no longer access to their outside pen (since ca 2 years ago).
I thought so as well, but I did see the door open to their outdoor enclosure in August 2017! Didn't see any of the animals outdoors, but one of them was lying in the door between the indoor and outdoor enclosure. My guess is that the door is closed most of the time, but opened on days with very good weather? I was also under the impression that they no longer had access outdoors, so was very surprised to see the door opened last year.
 
Belgrade zoo keeps Cuban crocodiles and American alligator outside during summer. They kept White-throated monitors and Green iguana outside also… and there is a pool full of Red-eared sliders - ex pets.
 
London Zoo has Galapagos giant tortoises in an outdoor enclosure and had a Chinese alligator in the old penguin pool.
 
La ferme de crocodiles in Pierelatte (France) keeps at least three non-European species outside: Nile crocodiles, Chinese alligator (no visible indoor enclosure) and African spurred tortoises.
 
I remember Cotswold used to keep a lizard species in the walled garden, I think it was an iguana of some sort and it was in a semi-circular enclosure attached to the tropical house. Not much in the way of detail but it was my first exotic reptile kept outside! :)
I think that enclosure was originally used for a fairly large American alligator.

I don't know if London or Chester still let their Komodo dragons sun themselves in their outdoor enclosures. I did once see the old crocodile monitor outside at Chester in 2014. I also remember seeing a rhino iguana in the old beaver pen at Regent's Park on a warm summer day perhaps 20 years ago (the site of that old pen is now part of the lemur walk-through).
 
I think that enclosure was originally used for a fairly large American alligator.

I don't know if London or Chester still let their Komodo dragons sun themselves in their outdoor enclosures. I did once see the old crocodile monitor outside at Chester in 2014. I also remember seeing a rhino iguana in the old beaver pen at Regent's Park on a warm summer day perhaps 20 years ago (the site of that old pen is now part of the lemur walk-through).
Bristol Zoo have their rhino iguana in an outdoor/indoor yard (just as an example).

Pierelatte - Chinese crocodile species in outdoor as temperate species (with hibernation preferably in an outdoor enclosure).
 
Artis in Amsterdam also allows their rhino iguana together with their Aldabra giant tortoises outside, and Blijdorp and Duisburg have respectively Galapagos and Aldabra giant tortoises with outdoor exhibits.

I guess the Australian water dragons comes from Pairi Daiza? Because they are no longer kept outside since a couple of years (even out of the collection I think).
 
Artis in Amsterdam also allows their rhino iguana together with their Aldabra giant tortoises outside, and Blijdorp and Duisburg have respectively Galapagos and Aldabra giant tortoises with outdoor exhibits.

I guess the Australian water dragons comes from Pairi Daiza? Because they are no longer kept outside since a couple of years (even out of the collection I think).
I have in recent years never seen the Galapagos (hybrid/crossbred) tortoises out on the lawns.
 
I have in recent years never seen the Galapagos (hybrid/crossbred) tortoises out on the lawns.
I think I have seen them once on the lawn a couple years back (2015 or something like that). I did forget however that the outdoor enclosure is also gone now, and I'm not sure wether it is planned to return or not.
 
I think I have seen them once on the lawn a couple years back (2015 or something like that). I did forget however that the outdoor enclosure is also gone now, and I'm not sure wether it is planned to return or not.
It is still there, just never used ....
 
Noah's Ark Zoo have a large outdoor enclosure for their Aldabra tortoises.
Budapest have (had?) an outdoor enclosure for crocodilians.
 
At the moment, there is still an outside part of the enclosure for the Galapagos giant tortoises at the Rotterdam Zoo (Blijdorp). Although they rarely use it by them. I only saw it used ones, last year. The part of the "Eiland-Hoppen" project will be realised upon its place.
 
I can't imagine they did very well, even in the really hot summer of 1976. London Zoo maintained an outdoor reptiliary for many years, mainly or entirely European species. I think nowadays Herring Gulls would prevent this (possibly less of a problem with Cobras......?)

London Zoo’s outdoor Reptilary, just inside the Main Gate, was built in 1927; it was originally called the Reptile Rock Garden and was swept away as part of the Sobell Pavilions development.

As you mention, it mainly housed European species (I recall both adders and grass snakes there in the 1960s) but on very hot days tropical chameleons were placed in the trees.

I was just looking around this morning and found an interesting post about the outdoor reptiliary at London Zoo - as mentioned, it seems to have been essentially a mix of European and British species with only one exception that I could notice.

A guide from 1935 lists the following species (I will include the old taxonomic names here):
  1. Great green lizard, Lacerta viridis major - I think a synonym for the Balkan green lizard, Lacerta trilineata
  2. Green lizard, Lacerta viridis
  3. Glass snake, Ophisaurus apodus
  4. Eyed lizard, Lacerta lepida
  5. Wall lizard, Lacerta muralis
  6. Grass snake, Natrix natrix
  7. Aesculapian snake, Elaphe longissima
  8. 'Dark green snake', Coluber gemonensis
  9. Northern viper, Vipera berus
  10. European pond turtle, Emys orbicularis
  11. Spanish terrapin, Clemmys leprosa
  12. Painted terrapin, Chrysemys picta
  13. Edible frog, Rana esculenta
  14. Common frog, Rana temporaria
  15. Several species of newt
Other sources also mention slow worms, smooth snakes and a big dark green snake that is possibly the green whip snake, Hierophis viridiflavus.

The open-topped display did have many problems, especially with predation. In one incident, all the small lizards were eaten by a flock of cattle egrets that the zoo allowed to fly freely while in at least one case a domestic cat jumped into the enclosure (in this case it was attacked by the large dark green snake and had to be retrieved).

Several other British zoos had similar reptiliaries for native reptiles - mentioned are Bristol, Edinburgh, Whipsnade and Dudley (the latter apparently might still survive, as the listed enclosure now used for meerkats).

More information, including photographs of the London Zoo reptiliary, comes from this link:
The Outdoor Reptiliary in Britain. 1. London and Other Zoos
 
I have found one rather interesting addition - in 'Captive Habitats', a book about building reptile enclosures by Beat Akeret that I got for Christmas, there is a description and photograph of an outdoor enclosure for red tegus (Salvator rufescens) at the Alligator Bay Reptile Zoo in Mont Saint Michel, France. What really sets this exhibit apart is that the lizards live outdoors all year round.

While it doesn't relate to a zoo, the author also includes an interesting account of keeping desert horned lizards, Phrynosoma platyrhinos, in an outdoor enclosure. While they lived outside year-round, in the winter the enclosure was draped in bubble wrap and a heating cable was snaked through the cacti. They lived for many years in this exhibit but never bred. Western banded geckos, Coleonyx variegatus, trialled in the same enclosure were removed because they emerged from their winter hibernation too early.
 
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