Allow more time than you anticipated, Especially if you are going to visit the art museum as well. We arrived in the afternoon and ended up splitting up so we could concentrate on what was all of the most interest. For me that is the birds. Sadly there are a number of taxidermy specimens of the extinct. My husband spent his quality time with the Egyptian exhibit. This museum is in the older section of the main building and even the elevators display their age well. It is well organized and maps are available. If you have walking issues be prepared to cover plenty of territory. There are many benches but also so much to see.