==Classification==* "A. palliata" group** Coiba Island howler, "Alouatta coibensis"*** "Alouatta coibensis coibensis"*** Azuero howler, "Alouatta coibensis trabeata"** Mantled howler, "Alouatta palliata"*** Ecuadorian mantled howler, "Alouatta palliata aequatorialis"*** Golden-mantled howler, "Alouatta palliata palliata"*** Mexican howler monkey, "Alouatta palliata mexicana"** Guatemalan black howler, "Alouatta pigra"* "A. seniculus" group** Ursine howler, "Alouatta arctoidea"** Red-handed howler, "Alouatta belzebul"** Spix's red-handed howler, "Alouatta discolor"** Brown howler, "Alouatta guariba"*** Northern brown howler, "Alouatta guariba guariba"*** Southern brown howler, "Alouatta guariba clamitans"** Juruá red howler, "Alouatta juara"** Guyanan red howler, "Alouatta macconnelli"** Amazon black howler, "Alouatta nigerrima"** Purus red howler, "Alouatta puruensis"** Bolivian red howler, "Alouatta sara"** Venezuelan red howler, "Alouatta seniculus"** Maranhão red-handed howler, "Alouatta ululata"* "A. caraya" group** Black howler, "Alouatta caraya"==Anatomy and physiology==Howler monkeys have short snouts and wide-set, round nostrils.
* "A. palliata" group** جیغ‌کش جزیره کویبا, "Alouatta coibensis"*** Azuero howler, "Alouatta coibensis trabeata"** Mantled howler, "Alouatta palliata"*** Ecuadorian mantled howler, "Alouatta palliata aequatorialis"*** Golden-mantled howler, "Alouatta palliata palliata"*** Mexican howler monkey, "Alouatta palliata mexicana"** جیغ‌کش سیاه گواتمالایی, "Alouatta pigra"* "A. seniculus" group** جیغ‌کش خرسی, "Alouatta arctoidea"** جیغ‌کش دست‌قرمز, "Alouatta belzebul"** جیغ‌کش دست‌قرمز اشپیکس, "Alouatta discolor"** جیغ‌کش قهوه‌ای, "Alouatta guariba"*** Northern brown howler, "Alouatta guariba guariba"*** Southern brown howler, "Alouatta guariba clamitans"** Juruá red howler, "Alouatta juara"** جیغ‌کش قرمز گویان, "Alouatta macconnelli"** جیغ‌کش سیاه آمازون, "Alouatta nigerrima"** جیغ‌کش قرمز پاراس, "Alouatta puruensis"** جیغ‌کش قرمز بولیوی, "Alouatta sara"** جیغ‌کش قرمز ونزوئلا, "Alouatta seniculus"** جیغ‌کش دست‌قرمز مارانیائو, "Alouatta ululata"* "A. caraya" group** جیغ‌کش سیاه, "Alouatta caraya"== منابع ==== پیوند به بیرون ==* Primate Info Net "Alouatta" Factsheets* Howler monkey audio recording* Information about howler monkeys from Belize Zoo (photos, video and audio included)* "The Loudest Animal in the New World," Smithsonian National Zoological Park