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.
Golden-backed Tree Rat
Mesembriomys macrurus
Cabrera's Hutia
Mesocapromys angelcabrerai
Eared Hutia
Mesocapromys auritus
Black-tailed Hutia
Mesocapromys melanurus
Dwarf Hutia
Mesocapromys nana
San Felipe Hutia
Mesocapromys sanfelipensis
Syrian Golden Hamster
Mesocricetus auratus
Brandt's Golden Hamster
Mesocricetus brandti
Romanian Golden Hamster
Mesocricetus newtoni
Radde's Golden Hamster
Mesocricetus raddei
Ferreira's Spiny Tree-rat
Mesomys hispidus
Long-haired Spiny Tree-rat
Mesomys leniceps
Hidden Spiny Tree-rat
Mesomys occultus
Para Spiny Tree-rat
Mesomys stimulax
MacConnell's Bat
Mesophylla macconnelli
Sowerby's Beaked Whale
Mesoplodon bidens
Andrews's Beaked Whale
Mesoplodon bowdoini
Hubbs's Beaked Whale
Mesoplodon carlhubbsi
Blainville's Beaked Whale
Mesoplodon densirostris
Ramari's Beaked Whale
Mesoplodon eueu
Gervais's Beaked Whale
Mesoplodon europaeus
Ginkgo-toothed Beaked Whale
Mesoplodon ginkgodens
Gray's Beaked Whale
Mesoplodon grayi
Hector's Beaked Whale
Mesoplodon hectori
Deraniyagala's Beaked Whale
Mesoplodon hotaula
Strap-toothed Whale
Mesoplodon layardii
True's Beaked Whale
Mesoplodon mirus
Perrin's Beaked Whale
Mesoplodon perrini
Pygmy Beaked Whale
Mesoplodon peruvianus
Stejneger's Beaked Whale
Mesoplodon stejnegeri
Spade-toothed Whale
Mesoplodon traversii
Aritana's Brown Four-eyed Opossum
Metachirus aritanai
Common Brown Four-eyed Opossum
Metachirus myosuros
Guianan Brown Four-eyed Opossum
Metachirus nudicaudatus
Grant's Rock Rat
Micaelamys granti
Namaqua Rock Rat
Micaelamys namaquensis
Rio Acarí Marmoset
Mico acariensis
Silvery Marmoset
Mico argentatus
Golden-white Tassel-ear Marmoset
Mico chrysoleucos
Snethlage's Marmoset
Mico emiliae
Santarém Marmoset
Mico humeralifer
Black-crowned Dwarf Marmoset
Mico humilis
Rio Aripuanã Marmoset
Mico intermedius
Golden-white Bare-ear Marmoset
Mico leucippe
Marca's Marmoset
Mico marcai
Maués Marmoset
Mico mauesi
Black-tailed Marmoset
Mico melanurus
Munduruku Marmoset
Mico munduruku
Black-headed Marmoset
Mico nigriceps
Rondon's Marmoset
Mico rondoni
Sateré Marmoset
Mico saterei
Schneider's Marmoset
Mico schneideri
Intermediate Lesser Grass Mouse
Microakodontomys transitorius
Southern Mountain Cavy
Microcavia australis
Jayat's Mountain Cavy
Microcavia jayat
Thomas's Mountain Cavy
Microcavia maenas
Northern Mountain Cavy
Microcavia niata
Shipton's Mountain Cavy
Microcavia shiptoni
Sorojchi Mountain Cavy
Microcavia sorojchi
Montagne d'Ambre Mouse Lemur
Microcebus arnholdi