The classical tradition that attested to the realness of mermaids continued well into the seventeenth century, with sources like Ulisse Aldrovandi's Monstrorum historia documenting sightings of the creatures. Pliny also reported documentary evidence of Sirens, the beguiling mermaids who lured sailors with song to their deaths along the Nile (note the couple is called the Monstra Niliaca Parei). J.K. Rowling's colony of mer-people at the Black Lake use their voices to deliver a vital clue during the TriWizard Tournament.