Goeldi’s monkeys have thick, soft, black to brownish-black fur with a short mane atop their head as well as jaw whiskers on either side of their face. They have long, slender fingers with claw-like nails that they use to dig out insects from narrow crevices in rocks and trees. Goeldi’s monkeys have 3 molar teeth, unlike tamarins and marmosets, who only have 2.

Listed as "vulnerable" on the IUCN Red List (International Union for Conservation of Nature and Natural Resources).

• CZS Conservation - Species Survival Plan
• The Chicago Zoological Society administers the Chicago Board of Trade (CBOT) Endangered Species Fund, which supports conservation-oriented research. The grant program attracts dozens of innovative research projects each quarter, which have included callimico conservation.