Emile Deville was a French

French people

The French are a nation that share a common French culture and speak the French language as a mother tongue. Historically, the French population are descended from peoples of Celtic, Latin and Germanic origin, and are today a mixture of several ethnic groups...

 physician

Physician

A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

 , naturalist

Naturalist

Naturalist may refer to:* Practitioner of natural history* Conservationist* Advocate of naturalism * Naturalist , autobiography-See also:* The American Naturalist, periodical* Naturalism...

 and taxidermist

Taxidermy

Taxidermy is the act of mounting or reproducing dead animals for display or for other sources of study. Taxidermy can be done on all vertebrate species of animals, including mammals, birds, fish, reptiles, and amphibians...

Emile Deville, already an employee of Muséum national d'histoire naturelle

Muséum national d'histoire naturelle

The Muséum national d'Histoire naturelle is the National Museum of Natural History in Paris, France.- History :The museum was formally founded on 10 June 1793, during the French Revolution...

 joined the 1843 expedition of Francis de Laporte de Castelnau to South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

 with the doctor and botanist  Hugh Algernon Weddell

Hugh Algernon Weddell

Hugh Algernon Weddell was a physician and botanist, specialising in South American flora.Weddell was born at Birches House, Painswick near Gloucester, England but was raised in France and educated at the Lycée Henri IV, where he received a medical degree in 1841...

. He returned with many bird specimens, especially parrot

Parrot

Parrots, also known as psittacines , are birds of the roughly 372 species in 86 genera that make up the order Psittaciformes, found in most tropical and subtropical regions. The order is subdivided into three families: the Psittacidae , the Cacatuidae and the Strigopidae...

s including two new species Bonaparte's Parakeet and the Dusky-headed Parakeet

Dusky-headed Parakeet

The Dusky-headed Parakeet , also known as the or Weddell's Conure or Dusky-headed Conure in aviculture, is a species of parrot found in wooded habitats in the western Amazon Basin. It prefers semi-open habitats such as várzea, forest edge and forest remnants, but can also be found in coffee...

  which he described in 1851. He also described, with Isidore Geoffroy Saint-Hilaire

Isidore Geoffroy Saint-Hilaire

Isidore Geoffroy Saint-Hilaire was a French zoologist and an authority on deviation from normal structure. He coined the term ethology.He was born in Paris, the son of Étienne Geoffroy Saint-Hilaire...

, the White-tailed Titi

White-tailed Titi

The white-tailed titi, Callicebus discolor, is a species of titi, a type of New World monkey, from South America. It is found in Ecuador and Peru.-References:...

 and, with de Castelnau some crabs.