Mammals Active during the day

Golden-backed Squirrel Monkey

Saimiri ustus

iNaturalist Wikipedia

A vibrant and acrobatic inhabitant of the Amazonian canopy, the Golden-backed Squirrel Monkey is famous for its striking yellow fur and social complexity. These 'bare-eared' wonders bring a burst of energy and color to the tropical treetops.

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Quick Identification

Size

Body: 25-37 cm (10-15 in); Tail: 36-45 cm (14-18 in); Weight: 0.6-1.1 kg (1.3-2.4 lbs)

Colors

Golden-yellow back and limbs, greyish-brown crown, white 'mask' around eyes, and characteristic bare, pinkish-grey ears.

Key Features

Distinct hairless, bare ears lacking white tufts
Golden-yellow fur across the back and forearms
White 'mask' around eyes forming a high Gothic arch
Long, non-prehensile tail with a black tip

When You’ll See Them

Activity pattern Active during the day

Peak hours 7-11 AM, 2-5 PM

Season Year-round

Diet Primarily frugivorous and insectivorous; they forage for ripe fruits and actively hunt for spiders and insects in the foliage.

Habitat Primary and secondary tropical rainforests, particularly seasonally flooded Várzea forests and riverine areas.

Geographic range

Where Does the Golden-backed Squirrel Monkey Live?

Native to the heart of the South American continent, the Golden-backed Squirrel Monkey is primarily found in the central Amazon basin of Brazil. Its range extends south of the Amazon River and east of the Madeira River, reaching into the northern fringes of Mato Grosso. While its presence in eastern Bolivia is suspected, the core of its population remains within the dense, river-fed forests of the Brazilian interior.

Basemap © OpenStreetMap contributors

2 Countries

1.2M km² Range

Least Concern Conservation

BR Brazil BO Bolivia

iNaturalist / Verified observation data

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Behavior

These primates are exceptionally social, often moving in large, chaotic troops of 20 to 100 individuals. They spend the vast majority of their lives in the canopy, leaping agilely between branches. Their social structure is complex, usually female-dominant, with males often staying on the periphery of the main group except during breeding seasons.

In the wild, they are highly vocal, using a variety of chirps and whistles to maintain group cohesion while foraging. While they are generally wary of humans, they can become habituated to observation in areas where they aren't hunted, often ignoring trail cameras once they determine the device isn't a predator.

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Camera Tips

To capture these agile primates, your camera must be positioned high off the ground. Since they are strictly arboreal, mounting your AI camera 10 to 20 feet up a sturdy tree trunk, angled slightly downward toward a known 'travel limb' or a fruit-bearing tree, is the most effective strategy. Use a wide-angle lens if possible to capture the entire troop moving through the canopy.

Because squirrel monkeys move incredibly fast, you must prioritize a high shutter speed or 'fast' trigger setting on your trail camera. A delay of even half a second might result in nothing but a blurry tail in your frame. Set your camera to 'burst mode' or a short video clip (10-15 seconds) to capture the social interactions of the troop as they follow one another across the branches.

In a backyard or garden setting near their forest habitat, you can attract them using water features or native fruit plantings like guava or figs. If you use bait, ensure it is placed in a secure basket high in the trees to prevent it from being stolen by terrestrial scavengers. Early morning and late afternoon provide the best natural lighting for their golden fur, making the colors 'pop' against the green canopy.

Similar Species

Species that look similar or are commonly confused with Golden-backed Squirrel Monkey.

Common Squirrel Monkey

The Common Squirrel Monkey has prominent white hair tufts on its ears, whereas the Golden-backed species has bare ears.

Black-capped Squirrel Monkey

Features a much darker, nearly black 'cap' on the head and a more distinct Roman-arch facial pattern compared to the Golden-backed's Gothic-arch.

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Frequently Asked Questions

Golden-backed Squirrel Monkeys are strictly diurnal, meaning they are active during the day. They are most energetic in the mid-morning and late afternoon when they forage for food before retreating to high, dense foliage to sleep at night.

If you live near their native Amazonian habitat, planting native fruit trees like Inga or wild figs is the best way to attract them. They are also drawn to high-altitude water sources, so a suspended birdbath or water dripper in the canopy can be very effective.

They have an omnivorous diet consisting mainly of small fruits and berries. However, they spend a large portion of their day 'insect-snatching,' hunting for caterpillars, grasshoppers, and spiders among the leaves.

They are generally forest specialists but can be found in suburban gardens and 'urban forests' in Brazilian cities that sit within their range, provided there is enough canopy cover for them to move safely without descending to the ground.

The easiest way is to look at the ears; Golden-backed Squirrel Monkeys (Saimiri ustus) have bare, hairless ears, whereas the Common Squirrel Monkey has noticeably tufted, hairy white ears.

Golden-backed Squirrel Monkey measures body: 25-37 cm (10-15 in); Tail: 36-45 cm (14-18 in); Weight: 0.6-1.1 kg (1.3-2.4 lbs).

Native to the heart of the South American continent, the Golden-backed Squirrel Monkey is primarily found in the central Amazon basin of Brazil. Golden-backed Squirrel Monkey prefer primary and secondary tropical rainforests, particularly seasonally flooded Várzea forests and riverine areas.

The Golden-backed Squirrel Monkey is listed as Least Concern.

Peak season for Golden-backed Squirrel Monkey is Year-round.

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