Mammals of the WorldMammals of the World: A Photo Database of Every Mammal Species
Mammals are far more diverse than most people realize. Scientists currently recognize roughly 6,871 living species, grouped into about 27 orders and 167 families — from bats (Chiroptera) and rodents (Rodentia), the two largest orders by far, to small, specialized groups like pangolins (Pholidota) and aardvarks (Tubulidentata). Each family shares a distinct evolutionary history, from whales and dolphins (Cetacea) to primates, carnivores, and marsupials, and new species are still being described every year.
This site exists to build a free, open, photo-referenced database of that diversity. We're using it as the reference library for a mammal identification field guide app — the more species that have verified photos attached, the better that app can recognize mammals from a photo in the field. Browse the full species list below, search by common name, scientific name, order, family, or genus, and if you have a photo of a mammal you've encountered, upload it to help fill in the gaps.
Northwestern Arboreal Rice Rat
Oecomys trabeatus
Long-furred Arboreal Rice Rat
Oecomys trinitatis
Common Rufous-nosed Rat
Oenomys hypoxanthus
West African Rufous-nosed Rat
Oenomys ornatus
Okapi
Okapia johnstoni
White-tailed Olalla Rat
Olallamys albicauda
Greedy Olalla Rat
Olallamys edax
Andean Pygmy Rice Rat
Oligoryzomys andinus
Sandy Pygmy Rice Rat
Oligoryzomys arenalis
San Javier's Pygmy Rice Rat
Oligoryzomys brendae
Chacoan Pygmy Rice Rat
Oligoryzomys chacoensis
Costa Rican Pygmy Rice Rat
Oligoryzomys costaricensis
Delicate Pygmy Rice Rat
Oligoryzomys delicatus
Tschudi's Pygmy Rice Rat
Oligoryzomys destructor
Yellow Pygmy Rice Rat
Oligoryzomys flavescens
Fulvous Pygmy Rice Rat
Oligoryzomys fulvescens
Tiny Pygmy Rice Rat
Oligoryzomys gri
Grayish Pygmy Rice Rat
Oligoryzomys griseolus
D'Elía's Pygmy Rice Rat
Oligoryzomys guille
Long-tailed Pygmy Rice Rat
Oligoryzomys longicaudatus
Mato Grosso Pygmy Rice Rat
Oligoryzomys mattogrossae
Hairy Pygmy Rice Rat
Oligoryzomys messorius
Small-eared Pygmy Rice Rat
Oligoryzomys microtis
Moojen's Pygmy Rice Rat
Oligoryzomys moojeni
Black-footed Pygmy Rice Rat
Oligoryzomys nigripes
Pacheco's Pygmy Rice Rat
Oligoryzomys pachecoi
Highlands Pygmy Rice Rat
Oligoryzomys rupestris
Straw-colored Pygmy Rice Rat
Oligoryzomys stramineus
Utiariti Pygmy Rice Rat
Oligoryzomys utiaritensis
Sprightly Pygmy Rice Rat
Oligoryzomys vegetus
Saint Vincent Pygmy Rice Rat
Oligoryzomys victus
Morris's Flying Squirrel
Olisthomys morrisi
Ross Seal
Ommatophoca rossii
Common Muskrat
Ondatra zibethicus
Bridled Nail-tailed Wallaby
Onychogalea frenata
Crescent Nail-tailed Wallaby
Onychogalea lunata
Northern Nail-tailed Wallaby
Onychogalea unguifera
Chihuahuan Grasshopper Mouse
Onychomys arenicola
Northern Grasshopper Mouse
Onychomys leucogaster
Southern Grasshopper Mouse
Onychomys torridus
Irrawaddy Dolphin
Orcaella brevirostris
Australian Snubfin Dolphin
Orcaella heinsohni
Resident Killer Whale
Orcinus ater
Common Killer Whale
Orcinus orca
Bigg's Killer Whale
Orcinus rectipinnus
Rocky Mountain Goat
Oreamnos americanus
Peruvian Rice Rat
Oreoryzomys balneator
Huancabamba Rice Rat
Oreoryzomys huancabambensis
Japanese Mountain Mole
Oreoscaptor mizura
Klipspringer
Oreotragus oreotragus
Balikun Jerboa
Orientallactaga balikunica
Gobi Jerboa
Orientallactaga bullata
Siberian Jerboa
Orientallactaga sibirica
Platypus
Ornithorhynchus anatinus
Giant Pocket Gopher
Orthogeomys grandis
Aardvark
Orycteropus afer
European Rabbit
Oryctolagus cuniculus
Beisa Oryx
Oryx beisa
Scimitar-horned Oryx
Oryx dammah
Gemsbok
Oryx gazella