An excerpt from a lengthy article on sewers:

New Scientist
April 1, 1995
Features, Page 17

The Effluent Society

Byline: Peter Aldhous

Like many of Hollywood's flights of fancy, however, some of its unlikely sewer tales contain a grain of truth. In 1984, a live baby Nile crocodile was pulled out of the Parisian sewers. Today, it lives in more desirable surroundings at the Tropical and Oceanographic Aquarium in Vannes, Brittany. And in Florida, alligators quite regularly crawl into the storm drains. Dennis David is section leader of the Florida Game and Fresh Water Fish Commission's alligator management programme. He receives some 10 000 "nuisance alligator" complaints each year. Most incidents happen above ground, but around a dozen involve alligators in the culverts beneath roadside drains. These animals are quickly removed, to avoid tragic child-alligator confrontations. "Kids play around the drains and they begin poking sticks and throwing rocks at them," says David.