This year's summer was the Earth's hottest since global record-keeping began in 1880. Large parts of the Northern Hemisphere – including areas of the United States, Europe, and Japan – experienced scorching heatwaves. Humans comfortably rode out the extreme weather inside air-conditioned homes and offices. However, the option was not available to most zoo animals. Here are some creative ways that zookeepers used to keep the animals safe in the heat.