Hippopotamus
Hippos and humans
Like many zoo animals, hippos were traditionally displayed in concrete exhibits. In the case of hippos, they usually had a pool of water and patch of grass. In the 1980s, zoo exhibits increasingly reflected native habitats. For example, the Toledo Zoo Hippoquarium features a 360,000-US-gallon (1,400,000 l) pool. In 1987, the Toledo Zoo saw the first underwater birth by a captive hippo. The exhibit was so popular, the hippos became the logo of the Toledo Zoo.
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