The Guyanan Red howler monkey[1] (Alouatta macconnelli) also known as Guianan Red Howler, is a New World Monkey native to Guyana, Suriname, Trinidad, Venezuela, and Brazil.
- Guyanan red howlers are somewhat sexually dimorphic.
- Females have a body length of 46 to 57 cm; males, which are larger, have a body length of 49 to 72 cm.
- Both sexes in this species have a long prehensile tail of about 49 to 75 cm.
- The coat color of both males and females is a deep reddish brown, although the shade slightly varies with age.
- These red howlers have a large neck with a massive lower jaw and hyroid bones, giving them an imposing expression.