Piazza Navona has two additional fountains: at the southern end is the Fontana del Moro with a basin and four Tritons sculpted by Giacomo della Porta (1575) to which, in 1673, Bernini added a statue of a Moor, or African, wrestling with a dolphin, and at the northern end is the Fountain of Neptune (1574) created by Giacomo della Porta. The statue of Neptune in the northern fountain, the work of Antonio Della Bitta, was added in 1878 to make that fountain more symmetrical with La Fontana del Moro in the south. At the southwest end of the piazza is the ancient 'speaking' statue of Pasquino. Erected in 1501, Romans could leave lampoons or derogatory social commentary attached to the statue.