Sayyiduna Abu Mas'ud (may Allah be pleased with him) narrates: We asked the Messenger of Allah (peace and blessings be upon him) about monkeys and pigs: are they of the offspring of the Jews? The Messenger of Allah (peace and blessings be upon him) said: "Allah, the Mighty and Majestic, has never cursed a people and transformed them such that their offspring continued, until He destroys them. Rather, this was a separate creation that already existed; then, when Allah, the Mighty and Majestic, became angry with the Jews, He transformed them and made them like these."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10074