When I use the default zoo map, I usually add one near the entrance. It depends on the size of the map. I might use 2 in small maps, 4 in medium maps, and 6 in large maps. I usually try to space them far apart.
Make sure you have EA--I don't and it crashed the game =( If it's already happened to you, delete the duck from your files and your saved zoo will load with a warning message that some critters/objects may be missing, but everything else will be just fine.
Appears larger than the actual space it takes up, which could be handy if wrassling with nearby exhibit fences. This is a nifty little thing...you can walk in and look at the wee exhibits in visitor mode. Neat! 😄
I grabbed these along with the aquariums. Same review, really: "These are great, just what the doctor ordered as far as 'arachnid house'-type decorations. Fun to peek into in guest mode. They are also very small, and small is always good!"