Goeldi marmoset[1] or Goeldi monkey is a small South American New-World monkey living in the upper Amazon basin region of Brazil, Bolivia, Ecuador, Colombia, and Peru.
- According to a 1977 study by Hershkovitz, Goeldi marmosets are small monkeys with a length of 21 to 23.4 cm and a tail length of 25.5 to 32.4 cm.
- They are black or dark brown in color with possible areas of white on and around the face.
- The longer hair forms “a mane that covers the shoulders and neck and extends from above the base of the tail“.
- Adults have bright tail rings. Other features include claw-like nails on all fingers except the big toe.