So I was camping at the zoo this weekend

And it was pretty cool. Walking behind the scenes, feeding animals, visiting them at night, sleeping in a tent with all that crazy sounds around, etc.
To make a long story short: Would recommend! Check the zoos in your area if you can camp there.
In Cologne its definitive possible, check my photos: https://goo.gl/photos/F6nHLK2WkBxTznKo7