The small mammal house at Chester Zoo was built in 1960 and demolished in 1998 to make way for an extension of the elephant enclosure. The Rhinoceros House can be seen on the left.
The concrete enclosures stood either side of the entrance, and when the house was refurbished they were replaced...
Wagler's Pit Viper (Tropidolaemus wagleri). For over 20 years I had this photo labelled as a white-lipped pit viper. The fact that they look completely different escaped me.