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Bristly Mouse
Neacomys guianae Bristly Mouse image
Size: body=7.5 cm; tail=8 cm; weight=20 g
Description: Tiny mouse with spiny fur. Upperparts and tail dark greyish-brown, the back finely sprinkled with reddish hairs lending an overall grizzled "salt and pepper" appearance; belly white, grading to orangish on the sides. Tail about same length as head and body. Broad, flattened, spiny hairs obvious when fur is pushed backwards.
Activity: Nocturnal, terrestrial.
Habits: Solitary. Forages on the forest floor, or very occasionally on logs or in low vines, for insects, fruits, and seeds. Silent.
Habitat: Mature forest, especially dense vegetation near creeks and small streams, or seasonally flooded forest.
Status: Uncommon except near Iwokrama Mountain where it is more abundant.
Distribution in Iwokrama
Water Rat
Nectomys squamipes Water Rat image
Size: body= 20 cm; tail= 20 cm; weight= 200 g
Description: Robust rat with a thick tail. Soft, glossy fur of upperparts dark, blackish-brown grading to orange on sides; belly whitish grey, contrasting sharply with colour of sides and back. Tail long and thick, sparsely haired with a slight tuft at the tip. Hind feet large and broad, fringed with silvery white hairs on side, and partially webbed. Eyeshine dull reddish.
Activity: Nocturnal, semiaquatic and terrestrial.
Habits: Usually solitary, sometimes in male-female pairs. Always found near water, it feeds on a variety of invertebrate and aquatic vertebrate prey as well as fruits and fungi. Usually seen swimming or on logs near streams. Makes nests under fallen logs or tree roots near water. Silent, it may freeze motionless in beam of flashlight.
Habitat: Grassy areas, and along creeks and small streams in mature, lowland forest.
Status: Occasionally common in Iwokrama along small, seasonally ephemeral streams in forest.
Distribution in Iwokrama
Common Terrestrial Rice Rat
Oryzomys capito Common Terrestrial Rice Rat image
Size: body=12 cm; tail=12 cm; weight=50 g
Description: Medium-sized, terrestrial, dark mouse. Upperparts dark, blackish or reddish-brown, sides paler or orangish; belly greyish-white. Ears medium-sized, blackish, and nearly naked. Dark tail is about equal to, or slightly longer than, head and body, and nearly naked with no terminal tuft. Hind feet relatively long and narrow. Juvenile is grey, young adult dark brown, and old adult is sometimes reddish.
Activity: Nocturnal, terrestrial.
Habits: Solitary. Found on the forest floor, particularly in areas with good ground cover, near fallen logs and tree roots, where it forages for seeds, fruits, and insects.
Habitat: Primary or secondary forest and forest edge. Frequents most habitat types but most often encountered in terra firme forest or near very small creeks.
Status: The most common mouse-like rodent in Iwokrama.
Distribution in Iwokrama
Pygmy Rice Rat
Oligoryzomys fulvescens Pygmy Rice Rat image
Size: body=8 cm; tail=10 cm; weight=15 g
Description: Small, terrestrial, long-tailed mouse. Fur on back and head fairly coarse, orangish-brown sprinkled with black, grading to orangish or yellowish-grey on the sides; belly whitish-grey. Ears short and well haired, largely concealed in fur. Long, narrow tail, (longer than head and body) slightly paler below than above and only thinly haired, without a terminal tuft. Hind feet relatively long and narrow.
Activity: Nocturnal, terrestrial.
Habits: Solitary. Feeds on small seeds and insects in brush or tall grass.
Habitat: Most common in secondary brush or in cleared areas, but also occurs in primary forest, usually near tree falls or at forest edge within lowland forest. Sometimes lives in or under houses.
Status: Apparently rare in Iwokrama.
Distribution in Iwokrama
Small Arboreal Rice Rat
Oecomys bicolor Small Arboreal Rice Rat image
Size: body=10 cm; tail=12 cm; weight=30 g
Description: Small, red mouse. Upperparts uniform reddish-brown, contrasting with pure white belly. Long, brown tail with a slight tuft of hairs at the tip. Hind feet short and broad. Eyeshine bright reddish-orange.
Activity: Nocturnal, arboreal.
Habits: Solitary. This handsome mouse feeds on seeds and fruits. Most commonly seen darting around in low vines, small trees, or small branches.
Habitat: Primary or secondary forest and in clearings; favors low vines near creeks or in seasonally flooded forest. Often occupies roofs and rafters of buildings near forest, where it is easily seen.
Status: Locally common in Iwokrama.
Distribution in Iwokrama

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