 Most of the park's turtles live in Turtle Pond, and many of these are former pets that were released into the park.The Arthur Ross Pinetum, named after philanthropist Arthur Ross, contains 17 species of pine trees across a area on the northwestern side of the oval.The Yorkville Reservoir of the Croton Aqueduct system (also known as the Lower Reservoir or the receiving reservoir) was built in 1842 to store the city's drinking water.