Well, there are several milestones that might be considered in the progression of zoos in a modern era. And there, some of them are medically oriented, some of them are not, some are the improvements in just routine husbandry practices, certainly in nutrition, this is the case. But just kind of thinking about the veterinary profession itself, the first thing that happened was that these early veterinarians had no access to literature, they had to gain that experience themselves. And so gaining that experience was necessary. Then the next important thing was to share that experience. They did this through organized veterinary associations and so forth, both wild animals and general veterinary medicine. Then the other major milestone is the development of capturing restraint agents and the methods of getting those in to the animals. Then publications became another milestone, access to literature, bringing it to the foreground.
