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Lisbon Zoo is the zoological garden of Lisbon, Portugal, founded in 1884. It was the product of the efforts of Dr. Van Der Laan, owner of the largest aviary in Portugal at the time, with the support of Bento de Sousa, Sousa Martins, and May Figueira. In 1905 it was transferred to the present location in Sete Rios, Lisbon. About 2,000 animals of more than 300 species are represented, as follows:

The mission of the Lisbon Zoo includes the conservation and breeding of endangered species, as well as scientific research, and educational and recreational activities. About 800,000 people visit the zoo annually.

Mammals (formally Mammalia  /məˈmeɪli.ə/) are members of a class of air-breathing vertebrate animals characterised by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers with young. Most mammals also possess sweat glands and specialised teeth, and the largest group of mammals, the placentals, have a placenta which feeds the offspring during gestation. The mammalian brain, with its characteristic neocortex, regulates endothermic and circulatory systems, the latter featuring red blood cells lacking nuclei and a large four-chambered heart maintaining the very high metabolism rate they have. Mammals range in size from the 30–40 millimeter (1- to 1.5-inch) Bumblebee Bat to the 33-meter (108-foot) Blue Whale.