who discovered the species?
Joseph Oberndorfer
Compsognathus
"Compsognathus" is known from two almost complete skeletons, one from Germany that is long and another from France that is long. The physician and fossil collector Joseph Oberndorfer acquired the German specimen (BSP AS I 563) in 1859, 
what is compsognathus? A genus of small, bipedal, carnivorous theropod dinosaur. how does it look like? Chicken-sized, small, bipedal, long hind legs; the forelimbs were smaller than the hindlimbs; the hand bore two large, clawed digits and a third, smaller digit that may have been non-functional; delicate long narrow skull with tapered snouts.
wiki:4963496
Compsognathus [SEP] Discovery and species
"Compsognathus" is known from two almost complete skeletons, one from Germany that is long and another from France that is long. The physician and fossil collector Joseph Oberndorfer acquired the German specimen (BSP AS I 563) in 1859, discovered about the same year in the lithographic limestone deposits in the Riedenburg-Kelheim region of Bavaria, in the Jurassic part of a lagoonal region known as the Solnhofen archipelago. The limestone of this area has also yielded such well-preserved fossils as "Archaeopteryx" with feather impressions and some pterosaurs with imprints of their wing membranes. The German "Compsognathus" fossil itself most likely came from the Painten Formation of the Kapfelberg locality, specifically dated to the uppermost Kimmeridgian stage (150.8 million years ago); however, alternative possibilities include quarries near Jachenhausen or Goldberg, both from the Tithonian, to which stage "Compsognathus" has traditionally been dated.