Vampire bat
Overview
 
Vampire bats are bat
Bat
Bats are mammals of the order Chiroptera "hand" and pteron "wing") whose forelimbs form webbed wings, making them the only mammals naturally capable of true and sustained flight. By contrast, other mammals said to fly, such as flying squirrels, gliding possums, and colugos, glide rather than fly,...

s whose food source is blood
Blood
Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells....

, a dietary trait called hematophagy
Hematophagy
Hematophagy is the practice of certain animals of feeding on blood...

. There are three bat
Bat
Bats are mammals of the order Chiroptera "hand" and pteron "wing") whose forelimbs form webbed wings, making them the only mammals naturally capable of true and sustained flight. By contrast, other mammals said to fly, such as flying squirrels, gliding possums, and colugos, glide rather than fly,...

 species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 that feed solely on blood: the Common Vampire Bat
Common Vampire Bat
The Common Vampire Bat is a small leaf-nosed bat native to the Americas. It is one of three extant species of vampire bat, the other two being the Hairy-legged Vampire Bat and the White-winged Vampire Bat. Along with them, it is the only parasitic mammal. It mainly feeds on the blood of livestock...

 (Desmodus rotundus), the Hairy-legged Vampire Bat
Hairy-legged Vampire Bat
The Hairy-legged Vampire Bat is one of three species of vampire bat. Despite connotations of vampires, it mainly feeds on the blood of birds. This vampire bat lives mainly in tropical and subtropical forestlands of South America...

 (Diphylla ecaudata), and the White-winged Vampire Bat
White-winged Vampire Bat
The White-winged Vampire Bat is a species of vampire bat. It is the only member of the genus Diaemus. It is found from Mexico to southern Argentina and is present on the islands of Trinidad and Isla Margarita...

 (Diaemus youngi).
All three species are native to the Americas
Americas
The Americas, or America , are lands in the Western hemisphere, also known as the New World. In English, the plural form the Americas is often used to refer to the landmasses of North America and South America with their associated islands and regions, while the singular form America is primarily...

, ranging from Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 to Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

, Chile
Chile
Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

, and Argentina
Argentina
Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

.
Due to differences between the three species, they have each been placed within a different genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

, each consisting of one species.
 
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