I selected a few of the posters created by WPA artists for your enjoyment. Then as now, the government is not shy about giving us good advice. You can see more of these incredible posters HERE:
You can purchase prints of many of these posters. There is more than one Zoo poster. You want to see them all. I had a hard time selecting which one to use here.
The Federal Art Project (FAP) was the visual arts arm of the Great Depression-era New Deal Works Progress Administration Federal One program in the United States. It operated from August 29, 1935, until June 30, 1943. Reputed to have created more than 200,000 separate works, FAP artists created posters, murals and paintings. Some works still stand among the most-significant pieces of public art in the country. - Wikipedia
Did you know that Philadelphia once had a municipal acquarium?