So many zoos have their areas publicized and widely cited, and this information can be easily found by doing simple Internet searches: for example, Brookfield Zoo is 216 acres, San Diego Zoo is 100 acres, Reid Park Zoo is 24 acres, and so on. However, it was brought to my attention on another thread by jayjds2 that the San Antonio Zoo, despite being alternately listed as 35 and 56 or 57 acres, is in fact far smaller than that. I've been using one of those online programs that maps area on Google Earth to test the sizes of zoos and compare them to their posted acreage, and I'm starting to wonder where the numbers are coming from, as some are spot-on with my calculations and others are way off. What does total area include? Can a zoo count its parking lot in the total area? What about area that is set aside for natural habitat? Are the numbers we see made using unique criteria that every zoo decides for themselves?