Back int the old fun days of the 1800s, there were as many as 150,000 horses in Manhattan. Here is a podcast from 99percent invisible about the Manhattan problem of horse manure.

For the record Gigglypuff (sp) is my favorite Pokémon.

The Big Crapple: NYC Transit Pollution from Horse Manure to Horseless Carriages - 99% Invisible

Rox of Spazhouse Intuitive Research