Some info on Craigend Castle:
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CRAIGEND CASTLE ZOO
The Wilsons staged a couple of animal collecting expeditions to Africa and needed to expand. From 15th April 1949 to September 1954 they ran an outdoor zoo at Craigend Castle, Mugdockbank, near Milngavie in the countryside north west of the city, but this proved difficult to get to by public transport. The collection included monkeys, crocodiles, an Indian elephant called "Big Charlie", lions and leopards, and many birds. The Chinese Pere David deer occasionally recorded in the wild near Loch Lomond stem from an escape from Craigend.
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Located north of Glasgow in Mugdock Country Park, the original Craigend Castle (owned by the Inglis family) was incorporated into a mansion in 1812. The property was later owned by the Buchanan family. The area was turned into Craigend Castle Zoo in the 1950s but that project failed. Mugdock Castle is located nearby.
I hope this is useful.
Regards,
Luceo