This is a list of the 183 species of mammals presently known or believed to occur in Iwokrama. Species marked with an asterisk have not been recorded in Iwokrama, but are very likely to occur there. Any information about their presence in the Iwokrama Forest will be of great value.
Carnivores
| Bush dog | Speothos venaticus | * |
| Jaguarundi | Herpailurus yaguarondi | |
| Ocelot | Leopardus pardalis | * |
| Oncilla | Leopardus tigrinus | * |
| Margay | Leopardus wiedii | |
| Puma | Puma concolor | |
| Jaguar | Panthera onca | |
| River otter | Lontra longicaudis | |
| Giant otter | Pteronura brasiliensis | |
| Tayra | Eira barbara | * |
| Grison | Galictis vittata | * |
| Olingo | Bassaricyon beddardi | |
| Kinkajou | Potos flavus | |
| Coati | Nasua nasua | * |
| Crab-eating raccoon | Procyon cancrivorus | * |
Primates |
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| Golden-handed tamarin | Saguinus midas | * |
| Red howler monkey | Alouatta seniculus | |
| Black spider monkey | Ateles paniscus | |
| Brown capuchin monkey | Cebus apella | * |
| Wedge-capped capuchin monkey | Cebus olivaceus | |
| Squirrel monkey | Saimiri sciureus | |
| Guianan Saki monkey |
Pithecia pithecia | |
Hoofed mammals |
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| Tapir | Tapirus terrestris | |
| White-lipped peccary | Tayassu pecari | |
| Collared peccary | Pecari tajacu | |
| Red brocket deer | Mazama americana | |
| Gray brocket deer | Mazama gouazoupira | |
Anteaters |
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| Pygmy anteater | Cyclopes didactylus | |
| Giant anteater | Myrmecophaga tridactyla | |
| Tamandua | Tamandua tetradactyla | |
Sloths |
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| Three-toed sloth | Bradypus tridactylus | |
| Two-toed sloth | Choloepus didactylus | |
Armadillos |
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| Naked-tailed armadillo | Cabassous unicinctus | * |
| Great long-nosed armadillo | Dasypus kappleri | |
| Nine-banded long-nosed armadillo | Dasypus novemcinctus | * |
| Giant armadillo | Priodontes maximus | |
Opossums |
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| Bare-tailed woolly opossum | Caluromys philander | * |
| Water opossum | Chironectes minimus | |
| White-eared opossum | Didelphis albiventris | * |
| Common opossum | Didelphis marsupialis | |
| Gracile mouse opossum | Gracilinanus emiliae | |
| Murine mouse opossum | Marmosa murina | |
| Slender mouse opossum | Marmosops parvidens | |
| Brown four-eyed opossum | Metachirus nudicaudatus | * |
| Woolly mouse opossum | Micoureus demerarae | |
| Short-tailed opossum | Monodelphis brevicaudata | |
| Gray four-eyed opossum | Philander opossum | |
Large rodents |
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| Common porcupine | Coendou prehensilis | * |
| Capybara | Hydrochaeris hydrochaeris | |
| Black agouti | Dasyprocta fuliginosa | |
| Red-rumped agouti | Dasyprocta leporina | |
| Acouchy | Myoprocta acouchy | * |
| Paca | Agouti paca | |
Small rodents |
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| Guianan squirrel | Sciurus aestuans | |
| Marsh rat | Holochilus sciureus | * |
| Spiny mouse | Neacomys guianae | |
| Water rat | Nectomys squamipes | |
| Water mouse | Neusticomys venezuelae | * |
| Small arboreal rice rat | Oecomys bicolor | |
| Common arboreal rice rat | Oecomys concolor | |
| Arboreal rice rat | Oecomys paricola | * |
| Rex’s arboreal rice rat | Oecomys rex | |
| Robert’s arboreal rice rat | Oecomys roberti | * |
| Arboreal rice rat | Oecomys rutilus | * |
| Trinidadian arboreal rice rat | Oecomys trinitatis | * |
| Pigmy rice rat | Oligoryzomys fulvescens | |
| Common terrestrial rice rat | Oryzomys capito | |
| Macconnell’s terrestrial rice rat | Oryzomys macconnelli | * |
| Terrestrial rice rat | Oryzomys yunganus | * |
| Climbing rat | Rhipidomys nitela | * |
| Greater climbing rat | Rhipidomys leucodactylus | * |
| Little tree rat | Echimys sp. | |
| Red-nosed tree rat | Echimys didelphoides | |
| Spiny tree rat | Mesomys hispidus | * |
| Cayenne terrestrial spiny rat | Proechimys cayennensis | |
| Cuvier’s terrestrial spiny rat | Proechimys cuvieri | |
| Warren’s terrestrial spiny rat | Proechimys warreni | * |
Bats |
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| Chestnut sac-winged bat | Cormura brevirostris | |
| Shaggy sheath-tailed bat | Centronycteris maximiliani | |
| Smoky sheath-tailed bat | Cyttarops alecto | * |
| Northern ghost bat | Diclidurus albus | |
| Greater ghost bat | Diclidurus ingens | |
| Brownish ghost bat | Diclidurus isabellus | |
| Lesser ghost bat | Diclidurus scutatus | * |
| Greater dog-like sac-winged bat | Peropteryx kappleri | * |
| White-winged dog-like sac-winged bat | Peronymus leucopterus | |
| Lesser dog-like sac-winged bat | Peropteryx macrotis | |
| River bat | Rhynchonycteris naso | |
| Greater two-lined sac-winged bat | Saccopteryx bilineata | |
| Grizzled two-lined sac-winged bat | Saccopteryx canescens | |
| Lesser two-lined sac-winged bat | Saccopteryx gymnura | |
| Brown two-lined sac-winged bat | Saccopteryx leptura | |
| Lesser bulldog bat | Noctilio albiventris | |
| Fishing bat | Noctilio leporinus | |
| Naked-backed bat | Pteronotus gymnonotus | |
| Greater moustached bat | Pteronotus parnellii | |
| Lesser moustached bat | Pteronotus personatus | |
| Woolly bat | Chrotopterus auritus | |
| Sword-nosed bat | Lonchorhina aurita | |
| Long-legged bat | Macrophyllum macrophyllum | |
| Orange-throated big-eared bat | Micronycteris brachyotis | |
| Davies’ big-eared bat | Micronycteris daviesi | |
| Hairy big-eared bat | Micronycteris hirsuta | |
| Brazilian big-eared bat | Micronycteris megalotis | |
| Common big-eared bat | Micronycteris microtis | |
| Tiny big-eared bat | Micronycteris minuta | |
| Niceforo’s big-eared bat | Micronycteris nicefori | |
| Tri-coloured big-eared bat | Micronycteris sylvestris | |
| Striped hairy-nosed bat | Mimon crenulatum | |
| Pale spear-nosed bat | Phyllostomus discolor | |
| Dark spear-nosed bat | Phyllostomus elongatus | |
| Greater spear-nosed bat | Phyllostomus hastatus | |
| Pale-faced spear-nosed bat | Phylloderma stenops | |
| Striped-headed round-eared bat | Tonatia saurophila | |
| Brazilian round-eared bat | Tonatia brasiliense | |
| White-bellied round-eared bat | Tonatia carrikeri | |
| Warty-armed round-eared bat | Tonatia schulzi | |
| White-throated round-eared bat | Tonatia silvicola | |
| Frog-eating bat | Trachops cirrhosus | |
| False vampire bat | Vampyrum spectrum | |
| Chestnut long-tongued bat | Lionycteris spurrelli | |
| Spear-nosed long-tongued bat | Lonchophylla thomasi | |
| Hairy-legged long-tongued bat | Anoura caudifer | * |
| Geoffroy’s hairy-legged long-tongued bat | Anoura geoffroyi | |
| Godmans’s long-nosed long-tongued bat | Choeroniscus godmani | * |
| Intermediate long-nosed long-tongued bat | Choeroniscus intermedius | |
| Lesser long-nosed long-tongued bat | Choeroniscus minor | * |
| Common long-tongued bat | Glossophaga soricina | |
| Dark long-tongued bat | Lichonycteris obscura | |
| Silky short-tailed fruit bat | Carollia brevicauda | |
| Common short-tailed fruit bat | Carollia perspicillata | |
| Little fruit bat | Rhinophylla pumilio | |
| White-shouldered bat | Ametrida centurio | |
| Lesser fruit-eating bat | Artibeus cinereus | |
| Medium fruit-eating bat | Artibeus concolor | |
| Little fruit-eating bat | Artibeus glaucus | |
| Dwarf fruit-eating bat | Artibeus gnomus | |
| Greater fruit-eating bat | Artibeus lituratus | |
| Sooty fruit-eating bat | Artibeus obscurus | |
| Large fruit-eating bat | Artibeus planirostris | |
| Trinidadian big-eyed bat | Chiroderma trinitatum | |
| Shaggy big-eyed bat | Chiroderma villosum | |
| Macconnell’s bat | Mesophylla macconnelli | |
| Heller’s white-lined fruit bat | Platyrrhinus helleri | |
| Lesser yellow-shouldered bat | Sturnira lilium | |
| Greater yellow-shouldered bat | Sturnira tildae | |
| Common tent-making bat | Uroderma bilobatum | |
| Brown tent-making bat | Uroderma magnirostrum | * |
| Common yellow-eared bat | Vampyressa bidens | |
| Brock’s yellow-eared bat | Vampyressa brocki | |
| Little yellow-eared bat | Vampyressa pusilla | |
| Great stripe-faced bat | Vampyrodes caraccioli | |
| Common vampire bat | Desmodus rotundus | |
| White-winged vampire bat | Diaemus youngi | |
| Funnel-eared bat | Natalus tumidirostris | * |
| Thumbless bat | Furipterus horrens | * |
| Peter’s disked-winged bat | Thyroptera discifera | * |
| Spix’s disked-winged bat | Thyroptera tricolor | |
| Brazilian brown bat | Eptesicus brasiliensis | |
| Lesser brown bat | Eptesicus furinalis | * |
| Greater red bat | Lasiurus atratus | |
| Lesser red bat | Lasiurus blossevillii | |
| Yellow bat | Lasiurus ega | * |
| Silver-tipped myotis | Myotis albescens | |
| Black myotis | Myotis nigricans | |
| Little yellow bat | Rhogeessa tumida | * |
| Greater dog-like bats | Cynomops abrasus | |
| Brown-bellied dog-like bat | Cynomops paranus | |
| White-bellied dog-like bat | Cynomops planirostris | * |
| Black bonneted bat | Eumops auripendulus | |
| Dwarf bonneted bat | Eumops bonariensis | * |
| Wagner’s bonneted bat | Eumops glaucinus | * |
| Sanborn’s bonneted bat | Eumops hansae | |
| White-flanked bonneted bat | Eumops maurus | * |
| Trumbull’s bonneted bat | Eumops trumbulli | * |
| Greater dog-faced bat | Molossops neglectus | |
| Lesser dog-faced bat | Molossops temminckii | * |
| Black mastiff bat | Molossus ater | |
| Little mastiff bat | Molossus coibensis | * |
| Common mastiff bat | Molossus molossus | |
| Lesser broad-eared free-tailed bat | Nyctinomops laticaudatus | * |
| Greater broad-eared free-tailed bat | Nyctinomops macrotis | |
| Lesser crested mastiff bat | Promops nasutus | * |